I started masturbating when I was about 9-10 and I have been frequently since. I'm 14 now and I've had sex 3 times but I noticed when I was having sex I kinda lost my erection. I'd masturbate almost everyday sometimes 2-3 times and I'm scared I over masturbated or I have ED. I'm a vegetarian but I usually get all the vitamins and minerals I need. I regularly smoke marijuana but I don't think that's the cause because the symptoms just started showing. It first happened yesterday, my new girlfriend and I we're hanging out and one thing led to another but, at most I could get was a semi-boner, and we tried to have sex and I got it but then it went away. It was awful, I was so embarrassed and it killed my night! I've gotten many hj's and oral from girl in the past and I've always been rock hard, but all of a sudden it's just not working! I don't know what's wrong and it's honestly frightening.