I'm not saying this is you for sure but people don't want to be around those who are negative with a woe is me sort of attitude. I don't doubt that you try to hide this from people but that may be part of the problem! People also don't want someone who is fake. And in hiding HUGE parts of yourself you are being fake. (I would be upset if someone I was dating seriously hid such a big thing about themselves.)

I think you should work on your self acceptance and self esteem. I think you lack confidence. If you were truly confident you'd have no problem with sharing these parts of yourself with a partner. You'd be able to say ok, if a guy doesn't accept me warts and all, *I* don't need HIM!

ETA Sharing doesn't equal dumping your problems on someone. If you are seriously dating someone and they can't even accept the fact that you have depression, why would you want to be with them?!?