Man, you just gotta grin and bear it. My freshman year I was pretty recalcitrant to talk to people... but I learned that (and I know this sounds stupid) smiling and saying hi is the best way to meet people. If they are not threatened by you, you can make much more progress.
As for the RAs, I eventually became one. While being nice to the RA will definitely get you points, don't rely on them for your social cues. Chances are, they have their own friends (likely the other RAs) and have a sort of authority vs underling mentality. You kinda have to in that situation. So go out and do stuff.
talk to people. The best way to get a friend, or a date, is to say 'hey, what's up?' and go from there. If you look like an ass, that's ok, there are 20,000 other people there.
All in all, just hang in there, and remember that the first group you hang out with will almost definitely not be the one you end up comfortable in.
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"Strange things are afoot at the Circle K, Ted"
-Bill
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