I don't think that this is weird. I think that you should figure out what it is you like about watching gay couples. Maybe there is something about the way that they interact with one another that you find attractive.

Nope, you just have a fetish. I can't speak for gay people but I can guess they'd be offended to know they're reduced to a fetish. Maybe we can't control what attracts us but at least we can control how to treat people and we're respectful and considerate maybe that's all that matters? That's my only suggestion. I don't think it has to do with your own gender identity, if you're questioning it.