If you think that going on a diet has something to do with nutrition, you don’t see the forest through the trees. It is a lifestyle. I know it sounds cliche, but you have to find things you love to do.
However, sticking with that goal in mind, you could make the resolution action-oriented by saying ‘get up 30 minutes earlier every Monday, Wednesday and Friday and do a 20-minute workout at home before work.’ Now you have an actionable path on how to achieve your goal.
You need to put what you learn into practice and do it over and over again until it’s a habit. I always say, ‘Seeing is not believing. Doing is believing.’ There is a lot to learn about fitness, nutrition and emotions, but once you do, you can master them instead of them mastering you.