I'm glad to hear your first day back went better than expected, even if you do have to take the writing 101 course. Hijinks is right, you should breeze through that.
As a college professor, I teach both freshmen and nontraditional students. I enjoy the nontrads. They're generally way more motivated, respectful, and understanding. I'd second the advice on looking to faculty/staff for social interaction while at school. While getting too social with your professors could cause some problems (no, not those kind, dirty people. The "I thought you were my friend. Why did I get a C?" kind), I'm sure you can navigate those waters with alacrity and, possibly, not feel so out of it while on campus.