Girls at your age are stupid, looking for excitement instead of stability. Trust us, its them not you (at this age).
If you have a rep for being a 'thug' or 'bad boy', can you try to clean your image up a bit? A more preppy, clean look? Also, if you are heading to college, this might be a good op to change your style. Lots of quality guys and girls there.
Hope this helps.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh