One of the issues is a lot people don't want to do amateur stuff. They aren't comfortable even starting because then they'll start comparing themselves to others and begin self loathing.
"Ugh, I'm 32 years old and I draw like a 3 year old. Fuck this."
This applies to more than just art.
"I can barely manage to operate the basics of a computer there is no way I'll ever code."
"I have no sense of rhythm and I'm out of shape I'll never be able to dance and not look terrible."
"Can barely socialize platonically at all, there is no way I'll ever talk to that cute girl/boy, I'm going to die alone."