>But last point: stop assuming, and hunt down the reason why girls are rejecting you. They aren't the only ones sending signals.
I think OP should mention to a male friend casually, like, "Dude, I can't seem to get any chicks... I feel like something is wrong with me." If he doesn't say anything particularly helpful, just ask him "Do you think there's something wrong with me?" Hopefully he'd be honest. It would be more helpful if he's someone who has seen how you act around women.