Sex and Marriage and Communication

Ok here is a little background, me and my husband meet 3 months after I had went through a late term miscarriage (5mos) at a military exercise, I fell for him because we used to stay up late and just hang with friends and whenever I needed to talk or vent he would take this long walks with me and just listen and give input if I needed it. Well we dated 6 mos before he proposed and got married on our 1 year anniversary. I knew he had kids I had met them once before we got married and we kept them for a few months. Well we have been married for almost 2years now and I'm fed up. I made myself very clear before marriage of my goals and he said I had his support. Last year he up and decided that he wanted to get the boys for the remainder of the year mind you we got married in septet had a short honeymoon then it was back to the real world and he got the boys in December I didn't agree seeing how I was in school for my Masters but wanting to be the good wife I don't argue long story short I ended up quitting school and work that year. School I couldn't focus with them and maintain the household and work and then he decided it would be cheaper if I kept them than sending them to daycare so he wanted me to quit but complains that we need two incomes. Fast forward to present I'm still not in school we just moved to a new city because he had a better job opportunity here  and once again he wants to gbe t the boys full time. Sex well it's every blue moon talking umm all we seem to do is argue and I don't want to seem selfish but we agreed to get the boys for the summer and that he would have them in a summer camp and I would find a job and go back to work. We moved end of May he got them in July no big surprise but I've had them all summer. Their mother is absolutely no help she has too many kids and can't afford them and thinks we are supposed to support her and them. So when we got them it was like receiving newborns and no baby shower or warning  we had to start from scratch. The kids are mannerable but the youngest is behind he is 5 about to be 6 hasn't been in school and doesn't know the basics. I want them to be in a better situation however I don't want to have to make all these sacrifices. But every time I try and express that it leads to an argument and I hate it and I honestly want out this marriage. Ages: My husband is 33 about to be 34 I'm 28 about to be 29 the boys are 7 about to be 8 and again 5 about to be 6. Am I wrong for wanting more and demanding that he old up his part of the bargain before we got married. I mean we don't date or anything he just expects me to do for free what he argues he has no problem paying for. My days are spent with the boys we barely have any alone time nor do we converse about anything other than me asking how was his day and if he likes dinner. Then he is off with the boys and then it's bed and the day starts over. I'm just frustrated.