"She said she wishes she never gave birth to me and that I'm the worst son someone could have" --
Haha! and do you consider this a negative thing??? At least, you have the perfect excuse now to avoid taking care of her when she's old and sick.
Look, my father's pretty much the same and I've decided not to take care of him when he's old.
But the difference between that bastard and your mother is that he hasn't said so explicitly (but I'm waiting for that day to come ASAP). Everyone knows how he's been and that's the perfect excuse for me to get rid of him...