Definitely have been there.
I've had some flashback/anger outburst out of nowhere around other people, and that really ruined social relationships for me. Not to mention those people who were present or involved during the rage/flashback, but just being around people in general too.
Living in the dorms, especially if you end up with a bunch of first year students.. can be very challenging. Try to see if you can find an RA that you can trust (if you can) and talk to, that could help. Also, staying in touch with counseling staff at student health services at your school can also help.
I am more or less high functioning on the surface, as long as I am in control of myself, on track routine.
For me, it's like taking an exam. I observe and study people's behavior and interaction in social situations to gain the spectrum of normality. Then, when I am in social situation, I recall what I've studied and act it out.
In a way, it is like creating an avatar of me to be shown to others.
I would imagine that this requires near complete detachment from self, but I have no idea how to be emotional or feel anything, so... it works fine for me, it looks like I am 'normal', when I am coping well, having myself well tamed.
I would not recommend doing it though.. I had been trying to feel something (other than bouts of frustration, anger, depression etc) for quite some time now and I am yet to succeed..
Good luck with school, keep us posted how things go!