I feel like everything I do is wrong?

Your step dad is being really abusive and violent person. It's really sad that your mom is just taking it lying down.

When your step dad is not at home, convince your mother to get out of this marriage. Your mother is most likely suffering from battered women's syndrome and while she may have already thought about leaving your step father, she may be having double thoughts, like all women in abusive marriages have, until it's too late.

If your step father has says words like "If your mum ain't here", he has already thought about your mother not being in the picture. He doesn't love your mom. He doesn't love you. He doesn't even love himself and that's why takes out his anger and beats animals to feel superior.

Tell her that he said that's how he will hit you. That's a threat. Your mom is supposed to protect you and it may gets worse as you keep growing. Protecting you might be a motivation for your mom to get out this bad marriage.

If he at any points hurts you or attacks you, don't be afraid to call cops or child support.

Please convince your mom to get out of this marriage and help and protect herself as well as you. The longer she stays in this, the worse emotional damage for you and your mom.

This marriage will not have a happy ending.

Jesus christ you and your mother should plan a time to jump ship! ! You cannot go on like this I say get some cash together and get out of dodge. If your mother doesn't want to go then you just pick her up and carry her out