I went through a similar situation myself a few years ago when I graduated HS. The summer before college is the most bizarre time in my life I have ever had.
Needless to say, I told my GF (of about a year) at the time that I didn't want to have to worry about maintaining a relationship while in college. I knew I was going to meet people and I knew I was going to meet someone that was going to knock my socks off (and I did).
Also, I must agree with schUsseln that the first year of college will produce the most change you have ever experience in life. Meeting entirely new people from entirely different places and living away from your parents will change you in a way you can't comprehend yet.
If I were you, I'd put the relationship in stasis for your first year of college. Maybe e-mail, chat, phone with her once a week at the MOST. It'll be hard for the first couple months until you establish your new life but you will begin to see how you are changing and she isn't. If after the first year of college you two still decide that you want to be together then go for it. If you love for each other can survive after that first year then you have a pretty good chance of keeping things alive for many years.
If you maintain your relationship, be prepared to face the temptations of flesh. As boys, we can't (at least I can't) help ourselves sometimes. I just get horny and then my mind goes to mush and I lose a rational part of my brain that would normally tell me "hands off or she'll get pissed".
Also, if you maintain your relationship you have to ration your contact with each other. For me, in my past long distance relationships I would begin to obsess and spend every moment possible thinking about being with my lover. This will become a problem when you start college because it will interfere with your ability to form friendships and aquaint yourself with new people.
I'm cutting myself off now, whatever you choose, just remember you can always change your mind
