I am 15 and never ejaculated, what's wrong?

Actually the title is a lie, I think I had a wet dream about 7 months ago but haven't had once since. I am still going through puberty. My penis hasnt grown much(less than 4 inches) and my balls aren't large.I've never masterbated. I still get random boners but I don't get them when I see just girls, there has to be action. Or I get them all the time around my girlfriend. Oh ya IM NOT GAY, NOR HAD GAY THOUgHTS. Is there something wrong?