How can I file a divorce?

My wife is doing mental and physical torture (abusing me and my parents and the rest of my family verbally and over the phone) on me since the next week after our marriage (17 Jan 2017). She is very much demanding of a Posh Life Style which I cannot bear. I am a simple clerk at a PSU. after all my loans and deduction I earn around 15K+ in hand. from there I do have to pay house rent and other expenses. She is also a working lady. Her demands of living/life style is increasing day by day for which I am loosing my sincerity towards professional and personal life. She is also a sadist and gets pleasure from abusing with slangs at any place be it a public place or home. She tried hurting me using knife few times. I cannot stay with her anymore. She even never lets me go to my home from last two years to visit my parents. Our conjugal life is a Big Zero as till date after marriage we never had any intercourse. She is not even ready to give me divorce and wants a money for it. Please assist ASAP.