My younger sister is 17 and has a lot of really good looking friends, I keep talking to them and sooner or later they become infatuated with me. My problem is I have a high regard for my sister but a low level of self restraint and I eventually start dating them and having sex with them. That's not the only problem I also have a distorted self image so I can be very confident one day and pathetic the next based on what I think of myself so they get tired or me or I get tired of them and its over for us. But what makes me an asshole is every time this happens my sister gains resentment for me and hates them so she looses a friend. I have done this a few times now and I think if I don't stop myself I'll do it again with her new friend, This cycle always repeats itself and I'm loosing my sister.Also there always 17 years old and I'm almost 22. Any comments please reply.