Torture by brother

I am a girl of 16. Totally dependent on my family.i don't know much about laws. And can't Do anything alone against the torture I bear.From the childhood only my brother have been dominating and always fighting with me.Early, family thought that he fights just in childhood. And they even kept on scolding me. time passed but his behaviour never changed .with the passage of time he got aggressive a lot.now he has turned into a GUNDA (Hindi word).and from last 3 years he has been torturing me alot. Not just me but also my mom . But my mom never complains.and my father could do nothing as he is disabled and some times even he is beaten by him. He respects no-one. And I don't know why he has a enmity from me. Just because I am a girl he abuses me a lot every time he sees me.i get no respect in my house.he talks all shits about me.for ex. To kill me so as to save dowry etc. He abides me from my rights .he has frightened me so much and says not to utter a word, he forces me to always bow down my head in front of him.every time he sees me gives me shits.and on every matter beats me badly. Now the condition has gone so worst that I am so frightened that someday he is gonna kill me.i get no way to deal with this. He has crossed all the limits to torture me.from using a belt to tube light. And when I tell my family members that I will complaint about him. They tell me that afterwords they would have no relation with me.sir please suggest me what I could do.