How to get Divorce from wife

Hi there, I married before four year with no child. From the day one of my marriage my wife used to fight with me as we have very less understanding between us. Gradually my wife have started doubting & blaming on me about my extra-marital affairs. she always tried to humiliated me and she always presume so many things that has no meaning. She is a narrow minded and introvert person, she always like to be in her room ,no outdoor activities, no life style nothing at all.I have tried 100 times to make her feel comfortable so that we can talk about issues between us but she never initiated a single thing to make things better between us. She is not happy with me at all nor I but she doesn't want to get divorce because she thinks I I'll be happy and she will not be. I have raised this issues with her parents where her father convinced me Manny times that she will not do any such things again but they are harmless because she doesn't care about anybody. She has that much negativity if someone try to help her she accused him or her that you have problems not me.She said she doesn't want alimony or doesn't want to file a case to court; but she will also not give divorce to me ever at any condition and said she will not let me go ahead in my life as her revenge. Now i want to move ahead in my life so, How can I get DIVORCE from my wife? Can I loose my job if I file a court case? I am a government employee. Please help me through this. Thanks.