Hi. We're quite similar, actually. I've always hated my body (I've been diagnosed with anorexia) and I also hav depression. If you are genuinely unhappy with your body, do something about it! If you suspect you are overweight, contact your GP to arrange a diet plan to help lose weight. Or you could start cutting down on carbs, etc and excercise 30-60 minute a day.
Your depression, however, needs seeing to. Tell your parents about it.