it's not about what kind of abuse you inflict. it's that you take even a step down that road. you're right to be concerned. why does it even occur to you to use your physical superiority to make your point? because you are feeling inferior in other areas, perhaps? Does she make you feel frustrated by saying things that you can't defend or asking rhetorical questions and then expecting you to answer them and look the fool?
the why, the why.
remember abuse runs both ways like a current. ...if she pushes you to the edge and wins when you snap and pop her one. a momentary injury in exchange for your guilt and remorse for weeks or months. it's a controlling thing.
I personally fear jinx, so i'm in no danger of hitting her....in anger
....but i did used to pick on my little brother unduly.....and years later still get embarrassed when i think of it.
You feel like a failure for having to resort to that, don't you?
so....own, it. and don't do it ever again.