I can't seem to control my habit of self-gratification. I've been doing it since i was 13,now I'm 21.I always stare at girls' bottom halfs and that escalates my sexual desire. Trouble is I'm not confident at approaching girls so I turn to the only remedy I know... self-gratification. I fear that this damages my sex organs and i won't be able to be fertile. Any ideas how i can control myself?