there is no reason to feel any shame over your past..infact if you knew how unfortunately common it all sounds you'd be shocked.
I think some of the questions you have faced in regard to yuor sexuality can be tied to 1. the molestations (damn bastards) and 2. to mom and sis basically showing you that men are scum.
it is a sad story to hear but it doesn't have to keep you down. I don't know that you will find your answers here...perhaps seeking proffesional councel in dealing with these deep rooted feelings may be in order.
