Do you think I'm gay?

I don't think you're gay at all. A lot of people wonder about this from time to time, but that doesn't mean you actually are gay. Having gay thoughts once in a while doesn't mean you are gay. It seems you're a lot more comfortable with guy-relationships than relationships; that ought to tell you something I would think... You may have been rejected by guys in the past, but you're young and have many years ahead of you, so don't let that push you in a direction you're not prepared to go.