I was 13, about to turn 14, when I first learned to masturbate. When I was younger, I was forever leaning/grinding onto things, and I'd get this wonderful feeling but I'd stop, uncertain of where to go next.
So one particular day, I researched the whole entire day on masturbation-penetration, touching, grinding, humping, you name it. I even tried humping a chair leg, but to no avail. In the evening I decided to try humping again.
I got a pillow, folded it in half, put it on my bed and straddled it so my legs were dangling off the side of the bed. It felt great!
But I didn't know what to do next. I couldn't read porn or anything, but I was worked up from reading stories about masturbating women all day.
So I randomly started thinking about how good Rupert Grint (Harry Potter had been on earlier that day) looked. Then, I got butterflies in my tummy so I kept grinding and then-BAM!
It was wonderful. I gasped and rode it out. Afterwards, I could barely walk as my clit was so sensitive. I've never got up to that amazing standard again, but it sure felt good.