How can I fix my marriage?

I dont know waht to do. me and my husband had always had a perfect relationship in the beginning and when I was pregnant. now that we have had our first child we just cant get along. we argue all the time. over nothing. and when we do fight it blows up so big that every time we make progress it just alll goes out the window. I dont want to seperate but I dont know what else to do. I refuse to stay somewhere where noone is happy. I also have to look out for my daughters best interest which includes providing a calm happy invironment for her. im just so tired of how bad we have gotten with each other. he barely helps me with our daughter and just wants to play video games. he is so selfish sometimes with how he wants to sell his dirtbike and buy another one and build a track when how cant even spend time with his family. we are broke half the time but when he wants something we always find a way for him to get it. he recently got a g1 which isa really nice like 3 or 4 hundred dollar phone. and I dont know im just frustrated. he hates my family (because he doesnt liket hte way they treat me sometimes) and he always has an excuse to not ever go to any family functions. it jsut sucks I feel like a single parent sometimes. and when I bring any of this up to him. he will jsut say oh well thats cause your falmily is sh!t. or “you hate me I will never be good enough for you, youwill never be happy, ect, ect…”

ugh I just dont know what to do anymore help please