The gay thing might explain 2 of those jobs but not the one where your boss was a lesbian, they tend to be very tolerant of gays even up to transgendered ones. So I think it must be some thing else. It could very well be a personality trait you have that your over looking or missing. I can tell you I have worked for a lot of women and some jobs 80% women. I am hardly a ideal worker but I never had a problem. I have noticed female bosses are much more strict then male bosses, usually any ways. Some people are really good at reading people and picking up on their weaknesses and then pushing the right buttons. I would suggest examining your personality closer and or ask some one you can trust that would be honest what they think. You don't have a sign on your forehead that says pick on me. It could very well be a personality trait though. I don't think it's because your gay. Good luck to you!