Long-distance relationships are a nightmare. They're only worth it if you're older and are seriously committed to the relationship. If you're a teenager, don't bog yourself down with that crap. It'll only end up hurting you, and you have so little reason to subject yourself to that kind of torment. You're young, have fun. Don't worry about tying yourself up over the girl because you have your whole life ahead of you. You can look forward to complicated bullshit like that when you hit your 20's. Take advantage of your youth and have fun with it.