Bad experience with my sibling

I have an elder brother. I am now stronger than him, but when I was young, I was way weaker than him. It was like he was a cat and I was a mouse. I got beaten by him almost everytime. I wanted to punch him, but I couldn't, because, as I said, I way weaker than him. I felt mad as if I had been an angry monkey when he hit me. I couldn't do anything about it. I just cried or told my mom on him. It was my everyday life in my youth.