Hi, welcome to the ehealth forum and I am glad to help you.
You have not mentioned your weight exactly so it is difficult for me to find if you are really obese or overweight.
If your weight is normal, then it might be distorted perception of yourself in your mind. Feeling fat about your body is not really about the body, it is about you. So, analyze how you feel about yourself. Some misguide themselves by thinking, "if I was not so fat I would feel okay about myself." Self-esteem comes in all shapes and sizes. I have seen very fat people with high self-esteem and I have seen thin people with very low self-esteem. No matter, what beauticians, bodyworks, and clothes designers promise us, they can't deliver self-esteem. We acquire self-esteem from within and not without.
You might like to consult your psychiatrist if it is a distorted self perception as it may progress to eating disorder and its consequences with anxiety and depression etc.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional.