“Never look to others for validation. If you believe in what you have done, that’s all that matters.” On the surface, you think yes, of course that’s right. You shouldn’t care what anybody else thinks.
But on second thought, wait a minute, that is completely wrong. Isn’t the whole point of the creative process to make things that other people will enjoy or connect with? If what you have made does not resonate with other people, what is the point? Is it enough for you to think it’s good, if nobody else does?
Some people create just to experience the joy of the process.
I'm in the middle of building an amp from scratch, and I'm not expecting it to sound any better than any of the very primo tube amps I currently own--several of which I built and several are vintage gems. Do I care what others think?
Nope. Not in the slightest. I'm having me some fun!
I'm no genius, but I agree with this guy.

Now, if you're engaged in an enterprise where others' opinions count, e.g., you rely on a market to support whatever you're creating, that is way different.