My husband is very abusive?

we have been married from last 4 months only but gradually after maariage i came to know that he is big drinker,smoker,lier,hyper & abusive..he alwz gets irritate on very minor topics,my life is getting hell day by day,sometime i feel i should commit suicide from such hell life,he alwz compare his family with mine....& if he spend a littel amount on me he alwz says to me about that expense,he had a girl friend before marriage,i want divorce from such person,what should i do????Please suggest as i feel nowdayz that my mind is not able to take good decisions due to all these problem ...