I don't know what is wrong. I'm a teenager and have recently been struggling a lot. I'm unsure whether I have an eating disorder or not but I've been restricting food a lot and really want to lose weight even though I have lost lots and have a underweight BMI. Friends have told me they are worried but my family do not think there is anything wrong. I feel the need to be thinner and something in my mind stops me making good food choices and sometimes leads me to fast or purge if I feel out of control. What should I do?