Thank you for sharing, I always find it interesting who here from people who fall a bit outside what's considered "normal". I myself am more or less a dominant straight cis male, and I enjoy that role, and I believe I play it well. But sometimes I find myself fantasising about submitting, not to a woman, but another man. Someone who'll be more dominant and just use me. It's a humiliating fantasy, which is part of the appeal. Just like you, I prefer women (almost exclusively), but in some ways that just enhances the fantasy. The idea of submitting to being someone else's plaything is equally humiliating and arousing. In that respect, I think we might not be that different.
Unlike you though, there's also a dominant side to me, who enjoys being the one doing the using, and it is the more dominant side of me. I suppose it's the dynamic I enjoy more than anything, and sometimes it's interesting to see things from the other side.
Come to think of it, I have played online with a few lesbians who felt that being used by a man was an added humiliation, and therefore an added cause of arousal. Perhaps not as uncommon as I initially thought...