hmm, well, i'm 18 going on 19 right now...so, i guess i don't have much room to talk, but if she loves you or whatnot, you don't have much to worry about...but, you're in what...10th or 11th grade? and she's a freshman in college...you're just gonna have to be ready for some change. i haven't started college yet, but it's a whole new scene change. she's gonna meet a *lot* of new people, but you guys have been together for over 10 months you said, so, it's perfectly normal to be paranoid. i'm sure you care about her very much

maybe you could just call her up and have a nice long talk about how you feel...get some insight from her 'n all. try it.
and good luck to you.