If you think of exercise as a 60-minute commitment 3 times a week at the gym you're missing the point completely. 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.
It's funny because in drama school my greatest strength was my range. So my early career was like that: I played all kinds of different characters.