Violence and mental harassment from parents

Dear Sir/Madam, I am a 22 year old male. From my childhood my father has completely denied me any freedom and liberty. I have lost my sense of psychological autonomy because of his intimidation and violence and now encounter frequent obsessive compulsive thoughts, insecurity and frustration. I have no control on my own thoughts. Often i think of committing suicide. I was a good student since childhood but by emotionally pressurising me using violence he forced me to take subjects of his own choice against my will. He uses uncontrolled violence, endless waves of threats and intimidation whenever I state my own opinion my studies have been destroyed and I am getting frustrated . I cannot study at all as there is always a strong deep rooted subconscious fear regarding my father as he becomes very violent so i cannot control my own thoughts as i cannot remove the fear how much i try to do so. I am actually afraid to think about anything which may make him angry. He always tries to force his own political beliefs (radical communism) on me and wants me to ideologically same with him and becomes very much aggressive if I slightly disagree with him. No one in house (my mother and sister) dares to say him a single word. My mental condition improves gradully when I am not in touch with him but again return i.e obsessive thoughts when i have some negative interaction with him. The constitution has granted me liberty of thought as a basic fundamental right. I cannot take it any more. Please let me know is there any legal method to get relief from this. Thank you.