I'm 20 too. My advice is to stay far away from the high school girls. Anyone who's young enough to be mad about which locker they've been assigned is too young.

Personally, I prefer the older ladies (and by that I mean someone my age or a few years older). They tend to come with a higher level of maturity. Plus (and I don't know what the age of consent is where you are) a 17 year old might not be legal. That could potentially turn ugly.
West Virginia's age of consent is 16.
I've only had one girlfriend. It only lasted a couple of weeks, but it was enough to get me to realize that most high schoolers are a few fries short of a happy meal. This was five years ago, so I wasnt exactly the college player myself.
Kinda reminds me of a song by Dr. Hook, "She was only 16, only 16, and oh did I love her so... She was too young to fall in love, and I was too young to know".
Just sayin'.