Is it selfish for me to ween?

St

My baby is 9 months old and won’t stop biting me, I’ve tried everything but he is splitting my nipples open and I am in so much pain now. I tried pumping but I’ve used different size flanges and every different speed possible and even bought a different pump but I can’t seem to get out more than 1-1.5 oz in a session. I feel guilty for not wanting to nurse anymore.