I am not really a Vonnegut fan, but this story inspired me years ago. It is so true that some things are worth doing because they are inherently interesting and fun. It doesn’t matter whether I am ever able to play like my idols (or willing to play in public at all). I can and should do them because I want to do them.
I have far more hobbies than most people. And some of them I do very well. People have asked me why I don’t turn them into a business (glass beads and carving tools). The answer is because the doing is the purpose. When I make someone else’s beads or blades, I lose the joy of making them.
Sometimes the only thing that matters is if you want to learn and do something like playing a violin, dulcimer, etc. You don't need to be good you just have to have fun.