Using of soy products is not recommended for people with thyroid disorders; some people with hypothyroidism are developing accumulation of fat around the hips.
You are not overweight for your height. In order to lose weight around the hips you do have to do exercises aimed at that area. Suggest you eat healthy foods, 3 times a day, and maybe you would not crave chocolate at night. Eat low fat meats (chicken, fish, loin of pork) or non-meat sources (soy products, nuts), low fat vegetarian combinations (rice & beans, pasta & beans, low fat cheese & pasta), low fat and substitute dairy products (1% milk, low fat/fat free yogurts, low fat soy milk/soy yogurt), use plant oils, non trans-fat margarines, and eat a lot of fruits and vegetables. Eat daily high fiber breads and cereals (oatmeal).