I began masturbating a 14. I found a copy of "Our Bodies Ourselves", and read the chapter on sexuality. When I read about female masturbation, I was amazed.
"Girls can do that?!"
I was also delighted. I ran into my room, locked the door, took out a vibrating massager I was using for back pain at the time, and didn't come out for two hours.
The frequency with which I masturbate fluctuates wildly. I think it may have to do with the hormonal changes of my period affecting my libido.