When I was very young and imaginative, I'd run around outside acting out stories I was making up, inspired by Power Rangers or video games. Sometimes I also imagined things like me being shipped off to boarding school and being punished, hit, humiliated. I'd imagine being pushed down, or forced to sit by the trash cans as punishment. I liked being pushed around, even if it was just in my head. This was, at the latest, when I was seven or eight--maybe even younger, I can't recall exactly.
Maybe we can get Freudian and say it's because I'm so docile compared to my older brother who always needs to be the center of attention, good or bad. So he was always the one being punished by our parents. So maybe that made me passive and fetishize submissiveness.
Or not, I dunno.
Anyway, when I was twelve or thirteen I had a computer with the internet in my room (my poor parents may have made an unwise decision there). I was aware of how sex worked because of elementary school sex ed, and I distinctly remember discovering masturbation by stumbling across the word and googling it. I happened upon a site where people sent in stories about masturbating, including different positions, tools, ways to do it, and stories of being caught. I learned about things like edging and got introduced to a few fetishes. Foot fetishes in particular was a big deal for me, so I went looking online for more feet stories, which of course introduced me to the idea of domination and submission and being a slave.
I ended up finding getdare because truth or dare turned me on a lot as a somewhat realistic way to explore my kinks.