Fat and Sad.. What’s wrong with me?

Patient: I’m 17, 5’2 and 125 pounds. I feel fat for my size and I really want to lose a lot of weight but no matter what I can’t. I feel so terrible about my body and I want to change. I’ve become depressed alot of the time and I feel like I have no energy at all.. Is there something I can do to feel better? Is there something seriously wrong with me that makes me feel this way?