I agree, your story is very similar to my friend's. She was once on the verge of 3rd degree obesity, but decided to change in time.
My advice would be to get outdoors more and be active. That doesn't mean you have to run, jump, and so on all the time. You just need to get outside at least once a day, breathe fresh air and go for a walk. Sunshine will add essential vitamins to your body, which will help boost your motivation. You should limit yourself from consuming free sugar and replace it with sugar found in fruits and vegetables.
My girlfriend tried to get an appetite suppressant
, but I wouldn't let her. Over time I learned that sometimes it helps. But do it at your own risk.
For reference: Free sugar is the same sugar (fructose, glucose, sucrose), but in this case it is extracted from a natural source (instead of being consumed as part of natural fruits, dairy products and some vegetables and grains). It is added to foods and beverages by food companies, chefs or consumers. This sugar has no health benefits and more often than not is unhealthy and calorie-depleting.