I need help!!!

I have tried everything with my cat to help fix his issues and nothing works he bites insanely hard to the point where he bruises me for weeks, he’s bit my face and his teeth drag into my skin it has gotten better he doesn’t bite as hard or frequently but I need it to, he will sit and beg for food like a dog, he gets into the trash can, the only way I can stop him from getting into the trash is to tie the cupboards and I can’t keep doing that. He will attack my arms or legs unprovoked. The first day I got him he bit my arm and held on while my arm was in the air I finally got him off and his teeth had sunk into my skin leaving a drag mark from his teeth and my arm was bruised for close to a month. I am losing my patience he will only cuddle on his own terms which is fine by all means but when he’s done he will literally claw me. I have so many scars from him people have made comments. I have had so many cats and back at my parents house I have 3 and none of them act like this, they don’t beg for food or steal it, they don’t bite ever, and they are the friendliest cats I’ve ever met in my life. I got him from the humane society and he was returned once before I got him because he was biting so bad. He is neutered as well. I am at my wits end with this cat and I need help desperately.