Well, back in sixth grade when I was 11, one of my friends jokingly said 'I'm going home to masturbate now. Nah, just kidding. I don't masturbate.' I didn't know what masturbation was, so I looked it up in the dictionary when I got home and got the not-at-all helpful definition of 'Stimulation of the genital organs for pleasure.'
So a few nights later, I decided to try something. I figured that stimulating your penis for pleasure would probably mean making it feel like putting it into a vagina, so I tried moving my hand up and down my penis with the 'OK' sign (thumb and forefinger tips together).
I didn't really feel anything, so I just kept doing it. About 5 minutes later, I was concentrating hard on it but getting bored. Then all of a sudden, I felt a tingling sensation then what felt like a cramp in my penis. After that it was really sensitive so I didn't touch it anymore. I was scared that I had hurt myself, so didn't do it again.
A few days later I tried it in bed again. I had been reading about masturbation on a website, and decided to try it again, except with a lube. So I spit on my hand and made the 'OK' sign and moved it up and down again and again. After five minutes, I got that familiar tingling again and this time I got the 'cramp' that by this time I knew was called an orgasm. But this time the orgasm was a bit stronger and longer, and since I knew what it was I wasn't afraid anymore. I've been masturbating ever since then.