I had a horrible, OCD, domineering stepmum also, and my dad sided with her. She would yell "you wait to your dad comes home" if I disobeyed some minute rule such as the order the cake tins were stacked in the cupboard. Then I would leave the house until late or be severely beaten.
It is what it is. Some folks deal with terrible illnesses/ disabilities and I dealt with a rubbish childhood. I only think about it these days when trying to understand my own bizarre reactions to a situation.
Now my life is focused on looking at my own limitations in achieving what I need. Sure my brain hooks on wondering why occasionally, but when I examine my own psychological behaviour it's not always healthy or exemplary, and that's all I have control over.