Hey, we're the same age! Anyway, do not bring up your sexuality. I wouldn't do it unless I was asked first. Ask him if he'd like to be more than friends. Mentioning sexuality may bring up the matter of homophobia if he turns out to be homophobic, which seems to be unlikely. If I were in your position (I'm gay) I'd just let him know how I feel.
Ehhhh same thing happened to me last summer. I just never took it that far. I regret it lol anyways I'd say wait till you find out more about him then go for it :3 good luck ^-^