I have been masturbating since a very early age as I didn't know about it back then and it used to please me. I try not to masturbate now but end up doing it once a while. I am very thin. Is it because, I've been masturbating for a very long time now? I also have constant pain in my lower back and sometimes, I wake up in the morning only to find out that I have ejaculated in my sleep. I feel all this has led to a decrease in my confidence level as I keep thinking about it and blame myself.