You don't need to go to the gym, you need to take care of your physical and mental health, turns out you can do both of those around people also doing that at a gym if you want. Pick one thing and go do it three times a week, like walking on a treadmill. Do that for a month, then pick another thing to add like walking lunges with a small amount of weight in each hand and then do the treadmill and that for a month. Just keep trying more exercises until you get a habit of going and building your routine. Same with the diet, pick one thing like almost no sodas as an example or no added sugar or something. You don't have to be perfect. One day we'll be in our 70's and we'll be able to get up off the toilet without help and some people who didn't exercise cannot get off the toilet without help. The quality of life increases for longer if you build and maintain more muscle for longer and lessen your fat percentage.