Cant cum :s

Hey! So im 15, kinda nearly 16 and i still havnt cummed. Havn't had wet dreams either :/. I have pubic hair, although not under my armpits only down there. anndd i think my voice is getting deeper...i think :p. But some people i know had to undergo ivf and couldnt have kids and to be honest im just really worried about that, what if i can never have kids? :(. I havnt seen a doctor and thats kind of something i don't want to do too because thats really, really out of my comfort zone. Yes i have tried masturbating but it doesn't even feel good, i get board :p So can someone please help me out with a bit of info here? thanks :)