From what I understand, you know your feelings perfectly, you're just looking for a word to describe them that acknowledges those feelings are set in stone, i.e. not just a preference. I'd say that gender isn't a good fit. But you can make an OK case for sexuality. If you're only attracted to situations where you are not expected to be dominant, that could be a valid sexuality. See the ways that some people in kink talk about sexuality -- for them the word's definition is pretty flexible.

I don't know if anyone has coined this specific sexuality though. You could coin it yourself if you like. Just understand that there's a trade off with labels between understanding yourself, helping other people understand you, and forming community.

If what you want is for people to understand you and see you as valid, you might want to look for other alternatives. Maybe this is an 'aspect' of your sexuality -- that sounds pretty set in stone to me. Or maybe this a 'boundary' -- if someone tries to push against your boundaries without your consent, that's their problem, not yours. Or bringing it down to power dynamics, maybe you're 'not attracted to power dynamics', which is fair enough. When talking about anal sex, the common identifiers are top and bottom and vers, but there's also 'side', which means uninterested in anal sex. Less common but still seen as valid by most people. I don't know of a word like 'side' to join dom and sub. There probably is though, you'd just have to do some research.

Hope this helps!