Can't be sure, but I think I'm the only guy legally able to drink that's responded so far.
I wouldn't advise kissing him while you're unsure about how you feel. If you do and aren't exactly swept away you'll find out you're not interested with a very strong sign of interest.
Whoever said, don't kiss him because then you'll be a slut is a moron of the first order.
I also think that if you're undecided on him, then its because you think he's cute and sweet and all, but he hasn't done anything so remarkably hot as to make you remarkably hot about him. Right now this is a puppy crush. This probably has a lot to do with the fact that his nuts haven't seemed to have dropped far enough for him to approach you about hooking up instead of wagging his jaw to your friends. Ten bucks says if he made a strong play, and thus showed his strength, you'd be all over him like white on rice. Normally this type of guy isn't worth pursuing, but you being a high school that standard might be a bit too high for most of the guys your peer group. (I'm not ragging on all high schoolers, but most of them are shy acne ridden flesh poscicles and not anything remotely mature enough to be called a man. Present company excluded of course)
I say test him, but do it without declaring your amorous intentions.
Granted he is only a high schooler, and probably an awkward columniation of nerves and insecurities, so get him alone. Arrange for a few moments alone in a comfortable environment with him. This isn't hard. Once I just stole a girl I was interested in away for a walk around the theatre before her parents drove her home. All you need is a few moments alone. The most I would do is some light Kino.
If he bites, maybe there's a possibility of a thing. If he doesn't, you'll meet better guys over the summer and ten bucks says (usually I'd bet a bottle of Cuervo and a Corona, but bearing in mind who I'm talking to) he'll be beating himself up over the summer and will resolve not ot be so pusstastic. You'll both be better off. He might even make a move on his own next year after he's cooled out a bit.
Good luck with the balless wonder.
-Cyrano