Is it doable? Definetely!
Would I want to do it? No Way
After seeing all the people who came to college with boyfriends and girlfriends from back home and then broke up with them eventually, I must say the cards are stacked against you.
A good friend of mine ruined most of his freshman year in college being tied down to a girl at home (true she did whip him, so it wasn't totally mutual). There are so many things going on at college that you have to make time for.
You will probably find yourself viewing High School girls differently than college girls, they are a lot different, in some good ways some bad.
I'm probably not going about this the most positive way but this is the best advice I can offer. It's definetely possible that you can pull it off, as everyone says it's been done before. However, DO NOT SELL YOURSELF SHORT. By this I mean that take advantage of what college has to offer you, and not just in women

If you two decide to go through with it, good luck to both of you, you will need it.
-Pete