Often, the “worst” dorms are the ones that aren’t chosen by upperclassmen in the lottery. This means they’ll be filled with freshmen and sophomores eager to make new friends. In a nutshell – ideal!
As for the person you were going to room with, you should get in touch ASAP and apologize. As in “I freaked out and was such a jerk! I’m so sorry and will do everything in my nature to suppress that part of me going forward. And I’m so sorry if I freaked you out too.” That was truly a bad move on your part, and it’s on you to make it right.