You can't quit thinking.
It's a phrase which means, quit over analyzing things. Which may be difficult for you, but not impossible.
Say I'm at my house. I decide to go somewhere. I walk out to my car and get in. Where do I drive to?
The point is, you NEED to get some hobbies, interests, etc. You're loneliness can be minimized if your mind is occupied (i.e. you are working on some project or goal).
You don't have to go out of the house to solve the problem of boredom. But i'm sure it would make life more interesting. Let's say you decided to write a book, or design a website...would you rather do that at your house, alone? Or at a coffee shop, where there's music and people watching? Or you'd work at both places, depending on your schedule, because writing a book would take months or years.
I don't know you at all; i'm only commenting based on your prior posts. So take this with a grain of salt.
1) What are your talents? Reading, writing, creating, drawing, music, listening, etc?
2) Take such talents and apply it to something worthwhile. (i.e. write a book about Church history, or create a website which organizes the history of the saints, or something related to your talents).
3) Most people with autism have very specific talents. You need to start using them for work/church/fun/all-of-the-above.
4) How about your read the whole Bible, cover to cover?
Even if you don't have a plan, start a project. A wise man once said, "A life of chaos is better than a life of stasis." It's better to have done and failed, than to have never tried.
And remember, we are given this life to work and to do. Not waste. If you have absolutely nothing to do, you had better be saying the full 15 decades of the rosary a day. Our Lady will never fail to reward you for this great work, which is prayer.