yes, you have a body image problem. think about it, what are the limits to how much you want to change yourself? If you stay on the path, you will never be happy no matter how "perfect" you are.
Health first. If you're body mass index is withing some range of reasonable (you can find these out on zillions of sites) and you still think you are not right, that pretty much is a body image issue. This applies to both overweight and underweight.