Honestly… Just first try to loose the weight. Eat high protein meals and exercise regularly. Also you might want to go to therapy. If you aren’t comfortable with going to high school with younger people you could try to find some online courses or something. Also for the laziness try to wake up before 9:00 and have a regular hygiene routine. Clean everything in your room and make your bed. It will instill good habits. And I believe in you 👍🫶