Mental Harrassment

Sir, I am a 25 yr graduate pursuing MBA. I am from Gwalior. Things are not easy for me since I have seen my parents attitude towards us. Since I were in school I have lost my brother and after that my sister, because both are not very good at their studies, but my parents forced them for that continuously and mentally abused them. Especially my father has an important role in that, they've beaten them and used such slang words, I am not able to pronounce them. Because of their torture my brother has commited suicide and he died in September 1999. After that I thought they'll change but they've not. They started torturing my sister. After sometime, every year she got some serious illness because of their torture and later on she died in October 2003. After that also his attitude does not get change about us. I also have one more sister which has got birth in July 1999 and which is very intelligent and studying too. But due to some argument between her and my father. They started torturing and metally abusing her. She tries to complain about my parents but nobody understands from the pain which she gone through. They beat and use slang words for her whenever she replies them. Later on she suffered from illness and she died in July 2016. Telling about me I like a girl which is 30 yr old and I am 25, I want to marry her after making my career, I tried to convince my parents but they're doing same thing with me. I don't want to die, I want to make my life and career. Help me Sir, What should I do ?