I know exactly how you feel and yes, it is a serious problem. It is typically the beginning signs of some sort of eating disorder for many. I have a terrible body image. I am a size 6 and you would think I was a 16 to hear me talk (I use to be a size 16 and lost alot of weight, but still feel no better about myself). I wish I could think differently... just as soon as I am feeling "skinny" I see a picture of myself and boom, back to feeling horrible. You could try a counselor. Usually it is something else that is causing our poor body image... I know what it is for me, but it took me years to figure it out. Try talking to a professional to get to the bottom of it. Good luck to you!!!