leaving husband

Hi ladies, I had my son 5 weeks ago and im planning to leave my husband. I am so scared to do this alone, all I do is cry. I'm sad for my son that his parents won't be together and that eats me alive but all we do is yell at each other and talk down to each other. We don't respect each other or pick each other up when we are down and our relationship isn't healthy for our son to be around. I need some positive thoughts, am I doing the right thing? We just don't get along whatsoever and I'm tired of fighting for this marriage when we both know we don't want to be together but I want my son to have a family.