Are you living in a dorm? You mentioned that your missing roommate was an RA, which usually means Resident Advisor in a dorm.
Dorms are pretty public places. Everybody is in everybody else's room. It seems unlikely that you could keep your crossdressing, or your female wardrobe, secret for very long. And if your roommate is an "advisor," then you'll have students -- probably freshmen -- stopping by at all hours for advice. How would a scared and confused kid, who's away from home for the first time, react if they saw you dressed? What if one of them complained to his or her parents??
So until you have a good idea of what your life is going to be like, and how tolerant the university is, I suggest you take it slow.