You pretty much have to grow up mentally and emotionally if you're going to be emancipated. Most people consider themselves grown up, but they're far from it. I'm almost nineteen, and sometimes even I still act like a child about things. My mother and I were at a point a few years ago where we fought constantly, even physically, too. It was bad, but that was also because I was immature when I was 100% that I was as mature as I could get.
Your mind likes to tell you things, and at the time you can think all you want how mature and ready you are to leave, but in reality you're not. I'm going to be moving to Seattle soon, and even I'm still having trouble figuring things out. Some people just have to get through a point in their life that's hard, especially with their parents, and it usually passes as you mature.