Procedure to take divorce from wife who is not coming back

Dear sir, I had done love marriage in 2015 ,all the expenses of marriage reception was bourn by me and till date I have not taken a single penny from their side. after marriage my wife behaviour was changed towards me and my family, everytime she want to go back to her home. In aug 16 her father came and took her with him in the name of celebrating Rakhi . Till date she did not came back and when I call her she insist me to leave my parents and live seperately with her. But sir this is not possible for me to leave my family as I am the only son of my parents. I have also call my father in law regarding this but he also threatened me telling that ''court me baat karenge". Looking after this behaviour of their family Now I am also not interested to live with her. I want to take devorce. Pls suggest me what to do now..Thanks