Why I am the way I am possibly

Dear Mr. J--I don't hardly know where to start this, but I have a few things I want to get off of my chest.  I feel as if I come on too strongly to get people to like me sometimes-particularly men.  I think I do this because of my poor body image due to my weight and because maybe I think my personality is not enough to keep them drawn to me as a friend so I turn to sex as a way to do just that.  When in reality, I probably end up pushing them away because I come off as some whore or too pushy, etc.  It seems to happen every time.  I just don't know how to stop.  I mean I am not saying it is not fun or whatever, but it leaves me feeling like shit.  SIGH.  SIGH AGAIN.