You can't ask a priest for the specifics?

If you're going with a bar with other people who go there as a meeting place for fornicators - well, that can't be good.

I need some answers right now regarding how I should live in the modern world and interact with non-catholics.

Is it an occasion of sin for me to walk into a bar and have a drink? Does it depend on who I am with and what type of bar it is?

Am I sinning mortally if I go to a bar with my friends and one friend ends up getting drunk and hooking up with a girl there? Is my presence causing scandal?

Is it a sin to hang out with non-catholics?

Hello Curiouscatholic, as tele said it is best to ask a Priest of course though I might just give my 2 cents worth. I think it really depends who you are with.

When it comes to drinking I think is very important to drink in good company as I know what it is like to drink with non catholics and I know they will usually pressure you into drinking more and more. This may not always happen though it happens usually.
Also if they swear a lot and talk about bad things and you are picking that up then thats not good. In my time in the navy I picked up a bad habit of swearing from being around that sort of people and its quite hard to kick.

Also I think bars may be places of immodesty and even topless bar maids.

In the wrong company one drink can lead to 5 and then to more and before you know it your inhibition has gone out the window.

Do I have an obligation to pull a "FR. Feeney" and call all of my family/friends and tell to start going to an anti-vatican II mass and start going to confession?

If I have told my friend that there is no salvation outside the church, and he doesn't really care and sticks with his modernist/protestant heresey, would I be sinning if I still engaged in social activities with him?

No if he has common decency then your good Catholic company and Charity could eventually win him over though if his company is bad and is leading you astray I would leave him be. But otherwise just try and be a good friend and obviously if you can try and win him over.

Sometimes when my novus ordo family has meals, I want to pray before the meal but I am embarassed with the attention and don't want to disrespect my parents. Am I sinning mortally by not praying before meals even though I know I should? I want to but I am waiting to get my own career and family.

If they are Novus then even by their standards they should be praying before meals so I would do it. Don't be embarrassed as you are doing it for Our Lord and it is a good way to lead by example and they may eventually follow suite. you don't have to do it out loud. Just say it internally and make the sign of the cross.

How should I tell my parents that they need to confess the mortal sin of contraception? Its going to be a very uncomftorable situation, but that conversation needs to happen because I fear that if they died right now their salvation would be in doubt because of that very issue.

Yes thats a hard one and maybe you can try and bring it up by speaking generally or by speaking of somone else so you don't have to come across as attacking them. Though I think it is important to tackle that one. Just try and do it indirectly so they don't automatically put the shutters down on you.

Is it ever a mortal sin not to say the daily rosary like Our Lady of Fatima asked us to? lets say I watched TV for 2 hours but never said the rosary that day. Would that be a mortal sin?

I don't think it is a mortal sin. It could be sinful in some circuмstances though. I think you have to ask a Priest that one. About watching TV, I would say that that can definitely be an occasion of sin at times. You have to be very careful and I would advise you to take it out the back. Then take a sledge hammer and make lots of little TV's out of it. Trust me you won't miss anything.
You can find out the news and weather in may other ways. And the news is generally alway misinformation and half truths.
TV is just a big valve at the end of a sewer pipe flowing into your house. When you turn it on, it dumps a load of filthy disgusting garbage in your house.

When co-workers braig openly about their sɛҳuąƖ wickedness and one night stands, do I sin mortally by just shaking my head and walking away? Or should I tell them straight up they are headed to hell?

Well I don't think its a mortal sin to walk away. If you can speak to them and show them the Christian purity then do it. If they will hear you then that is good. If they argue sensibly then you can show them and practice your apologetics at the same time. If they are stupid about it then the best thing to do is to walk away to show your disgust and disapproval.

Tell them that you don't like to treat girls as sluts. Ask them if they would like it if someone spoke of their Mother and Sister in that way.

Thanks. I MAY suffer from scrupulosity, I say MAY because it could be a sign that I should be a monk. Someone told me to read the "Dark Night of the Soul" because they felt it was appropriate for my radical conversion possibly and possible scruples/spiritual pride that follows.

The other problem is that most of my "friends" I have made in my life came before my conversion, and before I converted our typical friday/saturday nights consisted of heavy drinking and trying to meet/sinfully dance with loose women. Now that I am out of that stage I am no longer interested in these things. But sometimes I get lonely and I hate hanging out by myself. They know I am a traditional catholic and I have told them flat out "No more drunkeness and no more fornication" but I was wondering what the rules should be about just going to a sports bar or something and having two beers than driving home.

Being scrupulous really isn't a sign of anything other than scrupulosity.

As for drinking.. If you really want to do that so much and not get drunk, why not start your own home bar? You can have all the drinks you want in your home and YOU make the rules. No "loose women", no "heavy drinking" and so on. It'd probably (will) be better than going to the bar.

It's the same concept as going to the gym. You probably shouldn't go given the rampant immodesty, so you could just make your own system.

Very good advice here, especially  from Raoul and Zenith.