Baby decisons by Parents?

I have a question for anyone who has had these type of issues. I am with a younger woman who thinks she knows it all. We just had a newborn baby but all decisions whether it be his name, to be cirsisezd or anything that I know is like I don't exist. Every decison is made by her and she doesnt understand sacrifice or compromise. She wouldnt budge on cirsion which isnt that bad but I was asked what about the name after she alreadytold everyone else. She tells me what her baby will watch and that I wont be able to decide. We had an extremly tired and exhausted baby after coming home and although your suppose to feed them every 2-3 hours fed, he just wouldnt eat. She tried to wake him all day cause he was up all night and yet when he didnt wake up, She still tried to make him eat to no avale. She even took away his pacifier cause she claimed it was causing nipple confusion but he wasnt eating anyway..The pacifier was only used to Pacify him when he was trying to p gas or poop or just when he was a little wild. BUT never when he was hungry. She did this cause a WIC lady said so...Very Nieve; she trusts certain words yet although I have already had a child and know a lot..I AM STUPID. is what she says. Almost every decision she make about baby goes through her older sister because she thinks her sisters kids were brought up right. I explain that I feel like a stranger and that she needs to get help because she has acted this way before her pregnancy and she still is. She ALWAYS MUST BE IN CONTROL or else she gets irate and does very violent stuff. She has thrown remotes at my head, thrown dishes cut my Internet Cable ,Scratched up my Monitor, put holes in walls and even tried to take a bottle of sleeping pills and scratched up her wrists with a razorblade...while PREGNANT..She claims it's always me that starts stuff yet it's her that get's very angry and violent. I have wondered about just leaving but I have tried to make it work for the baby as well as I do care very much. One minute she will say she does have issues, but then says I am worse..I have never been violent towards her and if I were any other guy, I would have left a long time ago. AM I CRAZY.....What if any is the best suggestion to do in this case...I would rather be alone, pay child support than to be treated like an *** everyday for things I dont do.