Curious issues. Careful you don't over train otherwise, you'll start to burn the muscle you just built. Food is your friend, you are what you eat, so if you don't eat enough you won't bulk up. They are subtitutes out there that bodybuilders use, like the slimfast plan in reverse, but I haven't tried them out of aprehension, so I couldn't advise it.
The last thing you should do is label yourself as gay or straight, that's society trying to make sense of things. I suspect if you only find boys attractive in tights, it is probably out of admirartion, after all its what you want to be yourself, and there's nothing wrong with looking up to your peers. Some of them may have the body you're looking for, in which case ask them how they acheived it. They'll always play it down saying they don't work out, but don't be intimidated, just ask them, your worth every bit as much as them, so good luck in your career![/i]