Just take it slow and steady. Maybe join a club or two that doesn't have a necessity on being there every time? Where you can drop in and it'll be familiar faces, but if you don't show up or if you have to leave early it will be ok.

Do you get anxious in crowds or around groups of people? If so.. why not pick somewhere calmer that has a lot of people - like your school library? Take your homework or course readings there... and then find a spot that's as high-traffic as you can handle and then get to work.

Can you form a study group with anyone in your courses? It would be a common topic to work on, plus the added benefit of aiding you with your classes.

I don't deal well with people touching me either - although I have no clear reason as to why that's an issue for me. I think it should be easy enough to tell someone "we can't talk about that" if they bring up the subjects of rape or abuse. It's not a common topic and most people will respect your desire to not talk about that - you don't even have to tell them it's from experience, just that the topic makes you feel umcomfortable.

I hope you will have a good time out with the girls! If you aren't sure if you can handle staying out with them for long... and if you aren't comfortable with telling them why you want to leave early... just tell them when you arrive that you've got a pretty bad headache and aren't sure if you'll be able to stay out for very long. Then if you're comfortable with staying you can, and if you aren't after a while then you can tell them that the headache is getting worse and bail out. It's a lie, but I think that's the sort of lie that's ok and I do that myself sometimes.