To change the shape of your body or your overall appearance you need to be lifting heavy weights in a periodization style and most importantly you will need to change your nutrition. When you heard in your past "you are what you eat" you were not hearing just a silly phrase, you were hearing the truth. Take a good look at a horse. Most horses are nothing but muscle. They do not eat french fries or hamburgers or cheese or dressings. You may not eat these either while you are on your journey to changed your appearance.
Work each body part twice a week and adjust your calories so you are getting the right amount of calories and make sure your calories are the right KIND of calories. You will need to be sure you are getting enough protein and this will be a trial and error process. Hiring an online coach will expedite your results and give you a guarantee that your efforts will not be wasted.