Big, muscular guys are attracted to confidence. If you show that and can hold your own (how ever you wanna take that) then you shouldn't have a problem in finding one. For that matter, most men in general are attracted to confidence. When you got it and show it in a way that they can see it they come knocking.
Yes, most gay men are attracted to muscle or rather fitness I should say. That's a fact. However, if you don't have the confidence to match the muscle/fitness, have too much confidence and come off as a prick or don't have any confidence at all then you're as invisible as everyone else. Be you and be happy with you and make the most out of it. Improve yourself for yourself. Someone to your liking will notice it and will be all over you like stank on shit.
Best of luck.