Fun keeps you engaged in a difficult activity. Even if you are not good at what your are doing, having fun is important to keep you motivated and not giving into frustration. In the video below a running game was made with impossible controls. Yet the players are laughing their heads off as they watch each other try and fail. Failing was part of the fun. And they kept trying and kept trying and they were getting better as they made failing fun.
Find an activity that is fun. If biking is fun, do that. If you want to surf, well, you probably need to live near a coast. And if you do, and you fall in love with the ocean, surf. You will not be good at first, but have fun. Find what is fun and do that.
In your work towards a better you, remember to involve other people and have fun. Don;t be so serious. The work you do will lead to results. Relax and enjoy the journey.