I've read somewhere that only dedicated people, or people who actually put effort into their activity have the impostor syndrome.

It's like the famous philosopher said:

"The more I learn, the more stupid I feel".

Learning is partially understanding the world around us, but also opening our horizons, and discovering that there is a lot more to know, and there seems that there isn't a limit to the amount of knowledge one can get.

We can only put some effort into getting better every day, and hope that it is enough for our everyday challenges.

Learning is a never ending quest, and progress is relative.