Should I rethink my bf?

My boyfriend and I started dating when I was 16 and he 15. I  turned 17 in January and his ass doesn't turn 16 till August. We've had sex in the beginning of our relationship and we still do but I somewhat feel wrong because of our age difference. I mean I get he's a junior when I'm a senior but idk, it's hard to think about it when I'm 2 years older for quite some time ... what's your guys' opinion on this?