David- I'm sorry you feel this way. Most men, but especially gay men, struggle with masculinity. It's something that most men feel like constantly has to be proved and defended. You even see this among young boys on a playground. Masculinity also often means competition, and competition often causes sadness, because there's always at least one "loser".
Yes, a lot of gay men feel like they have to act, because our behavior was often policed by others when we were younger- "act more like a man!", "toughen up!", "don't be a girl!". Gay men who come across as masculine also do tend to have an advantage as well, and I do think it's more difficult for men who are viewed as more feminine. But I agree with you, most gay guys, no matter how "tough" they act, you can usually find that gay aspect of them sooner or later.
As far as being attracted to bi men, I would see this as many gay men who chase after married men. I guess you could call this a fetish within the gay community- I mean, I've certainly had my experiences with married men. You can try it out. At some point, you'll see though that they're never available, which may or may not be ok for you.
Life is hard already. It's just usually harder if you belong to a minority group. It's also sad that so much hate comes from within the community itself. Hugs