As for your high school friends: in all reality, most of them will be moving on, and perhaps moving away themselves. You staying in town isn't going to foster any more of a friendship. Anyway, you don't want to cling to your past friends and lose potential new ones.
As for your home friends, yes you won't see them as often. Yes you will drift apart from some or most of them. But you'll find that if you care enough to keep them after you start making friends at college, you will. I certainly have. So probably relax.