I am not a dr, but it seems to me your problem stems from the gynocomastia. I do not know a lot about that, but I agree that you should probably see a specialist to see if any hormones would help, if exercise would help or if surgery would be appropriate. It is hard enough being 16, when you don't feel good about your body it makes it much harder. I have always had a self-image problem myself and have felt fat no matter how thin I was. I also agree that you do seem very mature and together. I hope you find some help.