I think @cs44 is pretty bang on. Create a healthy lifestyle rather than trying to jam a diet into your current lifestyle. Eat real food, exercise regularly and fast a couple of times a week.
Getting into exercise can be hard if you’re out of shape (you might not get all the lovely endorphins straight up) but once you’re somewhat fit or strong you’ll hopefully get addicted.
Recognising the association between eating some jank (maybe feeling good momentarily) and the affect on your mind/body and the association between eating well/exercise and feeling good is important in building and maintaining the habit IMO.
And be compassionate to yourself 