Do you think I'm an ungrateful prick for feeling this way? Can anyone help me?

You don't sound ungrateful at all. It sounds as though your parents aren't helping you with your self-esteem. They may not even realise they're upsetting you, but obviously they are. Maybe try seeing a counsellor to discuss your feelings. They might have some practical advice as to how to improve your relationship with your parents, who I'm sure love you & aren't trying to upset you on purpose. I'm sorry to hear about your problem :(