I'm also 17, and actually have some experience here.
If you don't want to go out with her, for the love of God, DON'T BRING IT UP. If she does like you, she will tell you, or at least make it painfully obvious. When this happens, be direct about it. If she's not a *****, she'll understand. Or if you can't do that, just be a good friend.
If you do want to go out with her, then the scene will turn into a cliched 'friends becoming something more' object that may give Stephanie Meyer the will to write more terrible books. Your relationship will begin.
Oh, and welcome to The Escapist.