I didn't know anything until I was in my mid 20's. Even then I thought I was just kinky. I had no inkling that I was a sub until about 4 years ago.
When I started I knew I was into rope and pain. I was a bottom. All of my life I've been a bottom though. Even when I was topping it was done by request.
Four years ago I started reading because I knew there was a 'community' of folks that liked what I did. Everything I read about submission resonated with me. Since then I have been looking for that person I could give my all to. I think I've found him finally. He makes me want to submit to him more than just physically. I've told him as much. He is going sooooo slow its infuriating me, but I'm trying to be patient and let him lead me into the rabbit hole.