married as a minor now i realise she isnt the one

Im a hindu I was married on 23 april 2016 after being engaged for 20 months. I always had trouble with her as she always acts as a psycopath and harrases me mentally during engagement period and also after marriage. I wanted to break off engagement but couldnt speak up due to family pressure and stuff. Now i want a divorce but my wife isnt ready to give me and warns me that if i try to ask for divorce she wud put domestic voilence case against me pr commit suicide. So i wanted to ask if i cant nullify my marriage as i was a minor at the time of marriage i was born on aug of 1995 can i do anything to make my marriage void as i was a minor or there is no way out??