There's nothing to worry about. You go to class and take care of business.

I'd already been on campus many times before, so my first day I found all my classes pretty much spot-on. Five hours later I drove back home. Now my schedule is so sporadic that I kind of wish I was a freshman again. But yeah you'll do fine. In college there's no senseless socializing outside of class. In fact most people are by themselves drinking coffee or something.