My eyes welled up a little bit listening to this. Most of my 50 year life has been about the avoidance of doing the things that I need to do, but don't want to. I instead had settled snugly into my comfort zone: alcohol, nicotine, cannabis, video games, etc
It has only been in recent years that I've learned to understand that, for a better life, you must get comfortable doing uncomfortable things. To learn a new skill takes practice. And 'willpower' is simply just a skill. So practice it and it will get better.
Edit: THESE are the things we should be teaching our children. Inflation keeps us too busy to do so, and our education system is little more than an indoctrination system. Combine the two and it's little wonder we are churning out so many depressed, medicated, fat, no-purpose adults.