For one, submissive does not mean doormat.
Two, discussing limits and boundaries is key. Express yourself, if you feel you can't without being punished or ignored. Then for your own safety and sanity, ask to be released.

Feeling that you want to be with him can be deceptive. The endorphines submissive sexual situations creates is extremely addictive. Something all subs need to be aware of, these endorphines can mask as feelings, and rather intense ones at that.
Beyond that... COMMUNICATE!!!!!!!!!!!!! please please please
Be safe