Girls, my brother lost a testicle after a accidental kick. He has become violent towards me after his hormone therapy, what should I do?

He was bothering me, and I took the advice of a friend from school and kicked his sack. As a result, he lost a testicle. My family hates me for it, and they give him everything he asks for while he refused to come near me for awhile.
But recently, we began talking again and things are OK, but he got increasingly aggressive to me and just today he punched my stomach for taking his food. I got so angry I kicked him down there again and our parents found out about it and they grounded and yelled at me, but he hit me first.
I am afraid he will attack me again, and my parents have threatened to disown me if I used the only way I know to defend myself from him again. What should I do?
Girls, my brother lost a testicle after a accidental kick. He has become violent towards me after his hormone therapy, what should I do?
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