It was awkward the first year because it was a freshmen with a whole bunch of graduate students. So they'd drink often...I'm not really much of a talker, so I just stayed out of their way and they stay out of mine.
This year I have roommates older than myself, so they're a bit more talkative to me. It will be awkward getting used to their habits and sharing the bathroom (sometimes only ONE) with a few other people. You'll have to talk to them about bills and such. If you're living on campus, well...I can't help you there. Get an apartment if you want to escape from your roommates easier. You get your own room and everything, and it's usually cheaper to get an apartment anyway.
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Don't be afraid to stand up for what is right!