The key is to notice how you feel. Regardless of the sexual request the main issue is that this isn’t you. Just because it is something she likes doesn’t mean you have to enjoy it, too. Talk to her about it, try to negotiate what is something you would be willing to do, instead of something that makes you feel bad about yourself. This has to work both ways, otherwise YOU are the one being forced.
There is a delicate balance between dominant and submissive behavior between sexual partners. You may want to read more about this. If you look at the words to describe what she wants — dominated, pushed around, forced, and bullied, these are EXACTLY the feelings you are having. This is known as “controlling from the bottom” or “top from the bottom” in the world of dominance and submission. Top and bottom are not physical positions, but rather positions of power. You may want to read up on this through the various sites on the internet to learn more about what you are dealing with — and what will and won’t work for you.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral