The confidence I get from exercise is not just vanity. Sure, I like how I look and enjoy making progress, but my the confidence I get runs deeper than that. The better I get at running, the heavier weights I can lift and the further I can push my body reminds me of how to better tackle other challenges outside of my workouts.
Your long-term childhood exposure to these campaigns encouraged and capitalized on your appetite for immediate gratification at the expense of your long-term health. Now, as an adult, you're likely hooked and addicted to lifestyle choices of unhealthy food, alcohol, and late night sleep deprivation.