is there something wrong or sick about dating a girl that is 2 years younger than me. i am 17 and in grade 12, and the girl is 15 and in grade 10. we are not dating right now, in fact i'm not even sure if she remembers i exist, we just made eye contact at school one day. i thought she looked classy and attractive.
I seem to recall when I was 15, all the most attractive girls of my age were dating older boys. It's perfectly normal (although if I were dating a 15 year-old girl NOW I would be arrested!).
Go for it mate, as long as you remember to respect her age (she is still a child legally) you'll hopefully gain the respect of her and her family. Good luck to you.