At that age I had no idea what my dick was for other than pissing out of. My parents had never given the chicken and egg story and none of that stuff was ever mentioned. I was the oldest so I had no others to learn from.
One evening I was in the shower after surfing, we had one of those baths with the hand shower and a curtain that you pull across the bath to stop the water going everywhere. Using the hand shower I was washing myself and for some reason held the shower on my dick. It felt really good, I can't imagine why I hadn't done this before if it had felt that good - probably just a fluke, right timing who knows. Anyway there I was sitting in the bath getting an erection and not really understanding what was happening when suddenly I had my first orgasm. It was powerful and very unexpected and I thought that I had done some damage! I was very confused and excited at the same time. I remember thinking was I normal? I was quite frightened by this white stuff! What was it? Had I gotten rid of something vital to my body? But shit it was good so I tried to do it again but I was too sensitive.
I was really stumped by the whole thing and tried the next night but I think that the expectation or method was not quite right and nothing happened other than my Mom shouted for me to get out because I was using all the water up.
It was about two or three months later that I found out how to use my hand to do it and went at it way too much. I think I over did it because I had to stop from the small abrasions that I caused, of course I had never thought of using lubricant, but as you get older things get clearer and I have never looked back since.
I'm 37 now, married and still jack off very regularly whether we have had sex or not.