I agree with Psy. 122 for your height is a good weight.
However, you could be what is called Skinny Fat. That means you don't have any muscle tone under your skin. You may not have much body fat, but you may not have much muscle either.
Get your body fat and muscle tone measured. If you are working out, add some light weight lifting 3 times a week. After 6 weeks, you will begin to see some definition in your muscles and I think you will be a lot happier with your body image.
Good luck and please be careful with losing too much weight. It can be very dangerous.
I have often lost my mind, but never my imagination.