Dance: Help with turnout and fifth position?!?

I am a very serious thirteen year old dancer. I attend cles up to five days a week, and dance for about 3 and a half hours per day. Just recently, I have been noticing that more frequently my teachers have been talking to me about my hip placement and getting frusterated at that. They tell me that I will not be able to do anything if my hip placement is not changed. My teachers say that I have a tendancy to turn in my workin hip on the barre and that is why I am not balancing in the center, but I AM balancing in the center. I don't feel my body placement is off, and I don't see anything off in the mirror either. I am not sure what is going on. My teachers have been telling me to pull up more, but if I pull up anymore then I already am, I will be on releve! Someone serious please answer my questions as I am so in need of desperate help! I have never had this problem before, and all of a sudden I am getting picked on about this every cl even when I think I fixed it and my instructors are getting frusterated with me. I am a good student and always pay attention and never slack off, but why on earth is this happening to me? Did I just get lazy in the hips??? I really don't want to be picked on like this again!! Someone please help!! :[