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There’s more people than you know in the same boat.  I’m also by myself, have one living family member, not Catholic, and some distant relatives that I have no idea of where or who they are.  (They cut themselves off in a feud over a will about which my parents refused to take sides. Or maybe they cut my parents off, probably closer to the truth. I was only five years old when this happened.)  I live in a very small refurbished hunting camp with my dogs and a cat.  It’s in the middle of nowhere, which is very nice, on one hand, but not on the other.  I landed here due to losing my job, my apartment, and most of my stuff for refusing the jab offer.  It certainly beats living in my car in a big city, which is what I did for two months. 
I also don’t have regular Mass or Sacraments, although I’m better that way than the last two years when I had nothing.  Try your best to establish a rule of life.  Keep it simple as you aren’t a monk or an official hermit.  Prayer, however brief, morning, noon, night, plus Rosary or Stations of the Cross on Wednesdays and Fridays for Lent.  There’s a very concise, rhyming version in the back of the Fr. Stedman Sunday Missal that I like to use.  Weather permitting, try going for a walk while praying the Rosary.  Pray under your breath or think the words in your head if you’re around others and don’t want to raise the ire of a crazy person or have others dismiss you as insane.
Try getting a pet.  If a dog or cat isn’t realistic, what about a bird or turtle?  Lizard, snake, small rodent, or a tank with a few goldfish?  My sister kept two newts found in a campground in New Hampshire.  One of them lived his full lifecycle, emerging from the water and changing from dark green to bright orange.  Try keeping land snails or hermit crabs.  If you’re not squeamish, a scorpion or tarantula might keep your interest…or an ant farm!  Plants can also lift the mood.  They freshen the air and require at least a little care, some more than others. A carnivorous plant is interesting, or anything flowering.
Resist having a pity-party.  The only one who will come to it is the devil, and be assured, he’s the death of the party. 
As to prayer, don’t beat yourself up. If you forget or are feeling to low, remind yourself to just pray anyway.  Read a prayer or recite from memory.  Mary will fill in the “feeling” aspect if that’s even needed.  There are many things we do devoid of any feelings, just because they are right or necessary.  I don’t like hauling trash to the county environmental center (dump!), but I do it as needed or I’d have a dump surrounding my home.  I really dislike laundromats, but I have to go or wear dirty clothes and sleep in a soiled bed.  Prayer said just because…is better than no prayer. 
There are many people on the autistic spectrum, lots more since someone decided to call it a spectrum!  I’m 64 and was “diagnosed” at age 58.  In retrospect, yes, I was always the kid who didn’t fit in, who had some slightly odd behavior patterns, whose interests and ways of looking at the world were unusual, or who was sometimes deemed “not normal.”  Well, who cares?  I’m normal for me because I’ve always been as I am.  If God wanted me otherwise, He’d have made someone else.  It’s not sin we’re talking about.  I even got hired once for replying, “What you see is what you get!”  The interviewer questioned the fact that I was wearing Birkenstock shoes!  (Maybe I was a tree-hugging, fag-loving, communist liberal?)  No, nothing of the sort!  I wear only orthopedically healthy shoes.  Everyone in my family had foot problems, women especially, from cramming naturally wide feet into stylish shoes.  When young, my father wisely made we kids wear properly fitting shoes, stylish or not.  He had bad feet himself from poverty, having to wear shoes that were too small. My feet are pain free and flexible as ever.  I’ve never been to a podiatrist in my life!  If I go to Mass and all the other women are wearing pumps, high heels, pointed toes, and I’m wearing Birkenstocks, too bad.  You’re not supposed to be looking at people’s feet during Mass, anyhow! 
Here’s a great way to get started.  Post a large print Morning and Evening Offering Prayer to your bed or wall.  Say the prayers as soon as you awake and before you sleep.  Make a list of people to pray for, include souls in Purgatory, family, friends, acquaintances, world leaders, whomever… Whichever time is better, morning or evening, say one prayer for one on the list.  Cross them and move on.  Pray before meals.  If others don’t join you, take 30 seconds to bless yourself, bow your head, pray silently, and cross yourself.  Ignore others while doing so, even if they take no notice or deliberately keep talking, etc.  When done, join as if nothing were unusual, because thanks to you, it isn’t.  If need be, say, “I’m sorry, I didn’t quite hear your question/comment.”  After awhile, they’ll either respect you, or they’ll go on as before, in either case, God has been thanked.  If someone bullies, mocks, gaslights, ghosts, humiliates you in front of others, remove yourself from that person.  Confront him or her kindly, but firmly once.  Tell how exactly you expect to be treated.  If you’re ignored, remove yourself from this person in as much as possible. 
One more thing, friends needn’t be talking all the time.  Just walking, working, eating, sharing tea, reading, playing a game of chess, paint or sketch, whittle, or whatever, doesn’t require constant chatter. 

 

I attend an SSPX chapel and it's definitely nice to be able to receive the sacraments regularly, but it's damn near impossible to meet anyone. People go to mass and then leave. People go to a catechism class and then leave with no chance to interact with anyone. This is one area where protestants seem to do really well at. A protestant friend of mine met his wife at their church and numerous other couples all met at church activities. Their church is very active and it's not uncommon for nearly their entire social lives to be centered around activities at their church. It drives me nuts when priests complain about the lack of Catholic marriages in today's time but do absolutely nothing to facilitate good Catholic men and women to meet.

I do have some pets. 2 small dogs, a cat and a bird. Their company is definitely nice. One of the dogs was already mine; the other 3 animals I inherited from my mom when she passed. 

I get what you're saying about friends, I just don't have any real friends to even do those kinds of activities with. I have some "buddies" that I hang out with on occasion. Usually whenever we happen to be at the cigar lounge at the same time. It seems like any time I invite them to do something, they never can because of family stuff. I pretty much eat every meal alone so praying is not a problem or anything along those lines.

I think many of the suggestions are wonderful....for a non-autistic.  Initiating conversations with strangers is just not in the wheelhouse of most spectrum folks for a variety of reasons.

My son is on the spectrum so I have a bit of experience with the social training aspect.  My suggestion to the OP is to focus on social interaction rather than making friends.  Friendships grow from consistent social contact with those you have things in common with.  

It might be easiest for you to find group activities to join so you can blend in.  It would take the pressure off you to think of clever and interesting things to say.  Classes, Meetup, conferences, workshops, heck even traveling alone you can meet people.  I went on a day tour of a palace recently and met other singletons from all over the world at lunch.  

Even if you don't make friends you will be occupying your time and will be with other people.

Our parish priest always taught that prayer does not change God’s will for us ....
God has nothing to change, if He did, He would be imperfect.

This is incorrect. Luke 8:43-48 tells us that God willed hemorrhages on a woman for years, and when He, as the Incarnate Word, passed by her, He still had no interest in her healing, per se, but only when she, in faith, reached out to Him did the Messiah heal her. Her very act of reaching out to Him and having faith in Him signaled Our Lord, and He heard her, and He filled her want. If she had not called upon Him, to put a physical effort into touching Christ, He would have still allowed the woman to suffer her illness.

Another event where God changed His will is at the Wedding at Cana. Even Jesus told His mother that it was not yet His time, but she insisted, so He performed His first public miracle before the time He originally set (whenever it would've been) because it still had effected God's glory and it was beneficial to the souls of the people there.

Also, if God does change something, it doesn't mean He made a mistake the first time or He is imperfect. The change He grants will still effect His glory. God will not grant a prayer request if it doesn't effect His glory and it doesn't, ultimately, benefit the soul of the person(s).