My first scared the buttons out of me! I was like a preteen I think? I didn't know what an orgasm was. My sexual knowledge was merely: "Guys have a thing and they put it in the girls thing and they move. Somehow that makes them happy."
One day I happened to be looking around, ran into some lesbian porn and I was just poking around "downstairs". I was mimicking a video then suddenly practically out of nowhere I'm experiencing this wonderful but confusing feeling! I didn't understand it but obviously I decided I'd do it pretty often. I did end up finally learning about what it actually was called and all the details a bit later.