What does "suck" even mean in this context? A composer might still "suck" if they compared themselves to Johann Sebastian Bach, but is that the most important question in the scheme of things?

The one thing we can all become experts at is being ourselves. Nobody in the world, in fact, can do it better. I think it's best to focus on that.

The anxiety you're describing, I think, is endemic in modern society, especially among the professional class. Whether or not we choose to adopt it is up to us.