I want to end my marriage

We have been together for 7 years, married for almost 2 years. He's 24, I'm 22, and we have a 4 y/o daughter. Lately we've been arguing a lot, but there has been times were we laugh a lot, and just hang out. I feel like we're friends more than husband and wife, more than couple. He treats his friends better than me. He gets very affectionate with out daughter and his dog, and but I'm just left out of the loop. He's always playing video games, or on his phone. We argue about his dog, our relationship. We barely ever have sex. All he wants is blowjobs! I've been very unhappy for as long as I can remember and the only reason we got married was so he could get his citizenship, were still working on that, and I promised to him that I was going to give it to him, but I want a divorce. I love him, but I don't think that I'm in love. I don't think that both of us are in love anymore. Our relationship feels awkward. We were better off as boyfriend and girlfriend. We were even good while was pregnant! But everything changed after I gave birth. He worlds every day, and I'm the stay athe mom/housewife. I don't know what to do.