You can try it. I did. And I only had a 2 hour distance with 3 years put into the relationship. After another year of college (we were both starting at different colleges) we broke up and like many here have said, I was angry that I had missed so many opportunities. Luckily the next 3 years as a single guy were great.
Never go to a college because its close to a girl. Go where you want to go, or you'll regret that decision regardless of whether the relationship works out.
Also, if she's only 15, I hate to say it, but she is probably going to be ready for new experiences by the time she goes to college. Don't work your life around her only to have it blow up in your face a few years down the road. If it is going to work, it'll work no matter what the distance.
