Hi Shana: Well; first week under your belt.........been a LOT of new things,right? so give yourself a break and chance to get used to people,place,things; get into a "habit",etc...takes most people a little time to settle in.
As for the roommate sitatuation; do you have an RA or some residence hall director? If so, go talk to that person about options. Chances are the "partiers" will be anxious to be with other like-minded people, so there are bound to be people looking to switch roommates. Talk to someone about it would be my suggestion. Or even a switch on your floor?
Hang in there, and don't be so hard on yourself! Remember how upset you were a few weeks ago when you thought you weren't going to be able to go?
Have fun, try some new activities,etc.....just for the sheer fun of it, and just to see......that is what the best part of college is.......a chance to meet lots of dirrerent people with different ideas,etc and learn about new things.including things just for fun!