well you've come to the right place. you've joined a great team who are here to help you in your health journey.
everyones chemistry is different. people who can eat anything and not gain weight have no concept of what we go through. so try this,
first throw out all the junk food in your house.
then Use the food tracker. input everything that goes into your mouth. stay within your calorie range. watch portion size, keep healthy snacks on hand. apple, celery, etc. exercise. you must burn more calories than you eat.
exercising is key. I hope this helps