This was cute until I read how old you were.
Shake her off IMO. You'll be in college far far away and she'll be at high school. The girls in college will look better every day of you freshmen year until you break. But sounds like your a Junior, so maybe you could still get 2 years of a nice relationship, but I found High School ones just a waste of time. *EDIT* You are about to be a Senior looking at getting into colleges. This makes it a bit harder to do since your girlfriend will have little interest in you going far away. If she was older you guys could look at places together***
Even though she came up to you, it doesn't make it much better.
Then you turn 18 and shes 16. You screw up ones or something and then your in deep **** or if the parents don't like you and really wanna **** you.
oh man, I am full of gloom and doom. I wish I didn't finish the topic. I thought you were younger lol.