Speaking as someone who did most of his dating after highschool, and was well acquianted with getting hurt: Be cautious. A girl going into college (assuming she's going to college) in the fall will have lots of opportunities ahead, and when she's in the middle of a conversation with her friends about their boyfriends there will be akward moments when they say "Yeah, I'm dating this guy from the frat house down the road" , or "I'm dating a law student" then "Well, my boyfriend's a junior in high-school still...". It doesn't feel good to hear this, I know. But you've got to be realistic, meaning that a short term relationship may be viable, however in a year or two after you've invested your heart and soul into the relationship, the lightbulb may go on in her head and she may think she wants something different. It'd be different if she was younger than you. I don't mean to be blunt, but I've had this knife plunged into my heart before.