Hi there. I do not know why you are angry at your mom, or how you can get past this. I do believe there is a reason for your anger that makes some sort of sense, and I believe you can feel more at peace. Maybe you feel anger towards your mother, because she somehow enabled your father to cause you hurt? Being angry at a parent, not for what they did, but rather for what they did not do, meaning for example that they did not protect you from getting hurt, would be very understandable. Our feelings does not automatically die just because the person they are connected to, does.
If someone who knows you well says that you have become so angry that it is very difficult to be around, then perhaps try that idea out. Perhaps there is some truth to what he is saying. You seem to think yourself there could be. So maybe, you would benefit from having someone to talk to, a professional, that can explore this idea together with you, and help you live with more love and less anger. Best wishes.