I feel like an a**hole mom

It’s 4am and my son is still refusing to sleep. We usually co sleep, but right now he’s laying in his crib crying because he WILL NOT sleep. I’ve tried nursing him a million times and all he does is bite me and pinch my nipples and scream if I make him stop. I’m fairly against sleep training, but I’m at my wits end. I’m crying right now listening to him cry by himself but I don’t know what else to do. He just won’t stop and I’m at the point where I’m having dangerous thoughts. I haven’t slept in days and I just can’t take it anymore. I’m a terrible mom. I just need someone to tell me it’s going to be okay.