What exactly is the age range you're looking for? 18-20? I just ask because from what I've noticed, from this site and personal experience, at that age you're still exploring sex a lot. I'm not saying I'm not exploring my sexual side still because the obvious would be that I am. I'm just saying that maybe you can find a girl your age and potentially start letting BDSM trickle into the relationship. To where you're both trying new things together. I know 6 years ago, I was far from even thinking about anything like BDSM. And the bulk of the people I've seen on here seem to be from their mid 20s and up. I could be wrong on that. As stated above, I'm sure there are girls out there closer to your age.
I feel like I just rambled a bunch of madness lol I hope you find what you're looking for.