It seems like a good example of the described problem, however. I could also attempt to make a table, and I will conclude that I have seen many better tables made, which could make me feel bad.

The hard part is letting go of being the best, or even succeeding, in my opinion. It's cliche, but the attempt is what matters. If you run a marathon to win it, you will almost certainly be disappointed; but if you run it to be a better runner, to be healthier, or simply to say you did, you will be happier having done it than having not done it because you know you won't win.

Pick a subject without much difficult craftsmanship or creativity. One where you can just execute. Grow carrots. You won't worry about there being larger or nicer looking carrots grown by others.

I restore old bikes. It's easy mechanically, cheap, and projects are short enough to never be overwhelming (unlike e.g a car project). It's a nice analog change from computers.

Yeah, carrots are hard to grow. Saying they are easy are going to make people feel even shittier when they try

Actually, I do garden and have a hobby car (which probably frustrates me more than it makes me happy).

But you've obviously never seen a gardening competition. People absolutely worry about growing bigger and nicer looking carrots.

Comparison is the thief of joy. :)