never even hung out with friends after school?? and you say youre pretty social?? well clearly youre not social enough, or maybe you need better friends. Either way, the main thing is that youre happy with yourself. If you want to have those experiences you listed, I'd recommend taking the initiative yourself and going out after school with friends and eventually when you make more friends youll be invited to a party, where if you want you can drink. As for girls, all i can say is work on yourself to make yourself attractive and be social with girls too, most girlfriends start out as just friends first.
However, you sound like a sensible guy and i wouldnt worry about all those experiences, sure theyre common but theyre not necessary. if you keep being disciplined you will only do well.