As someone who was medically obese, and is still in the weight loss process, there might be a few contributing factors.
1. Keep a log of your food and about how much (1 large plate, 1 cereal bowl, etc.) This will help you take any objective look at your situation and determine if its food quantity or food quality that's the problem.
2. STAY AWAY from processed foods and sugar. Most processed foods have chemicals and sugar that damage the body. They are also usually made with poor quality food, if there is any real food actually in them. This can cause type 2 diabetes regardless of bodytype, and weight gain in most body types, no matter how much you eat. (See the documentary carb loaded on YouTube)
3. Keep to fruits, veg, and meat (mainly stuff you can cook in the kitchen), and avoid breads and processed carbs. Not only are grains usually highly processed before going on store shelves, but the body treats carbs (particularly grain carbs) in the same way as sugar. A slice of whole wheat bread is the equivalent to eating a candy bar, insulin wise.
For the vast majority of people, improving food quality and quantity is what ultimately fixes the problem. And prematurely medicating only masks the real issue. Do this consistently for at least 6 months, and if there's still no improvement, see a doctor. Your food log will prove it's not a food issue, and there may be an undying thyroid problem. GOOD LUCK!
Thank you so much for all the advice! You'll be happy to know that since August 2018 till now May 2019 I've lost about 70 pounds. I'm just about to hit the 300 mile stone, going downward though not up. I do have a thyroid issue. But I have to eat very little. Tons of greens and mostly liquids almost. Protein too. I've cut so much out. I'm off soda now and only drink sugar free juice mix and water. If I do have a soda it's clear and diet. But rarely.

I wish I was her so I could have a boyfriend. I'm already fat and I barely eat anything!