My gf can't satisfy me says I am too big and rough for her

My gf she is a skinny girl with a good curvy ass and tits I am male dom who is too aggressive and brutal in bed as I am former smut writer I do most nasty things possible and just degrade and use her brutally till she passes out while screaming but she can't take me in anymore as she is so sore and I am too big for her please help someone....[