Donald Hall said young would-be poets were mistaken to be so obsessed with being published. But you can imagine what it would do for a 24 year old to get a poem published in The New Yorker. Now to people he meets at parties he's a real poet. Actually he's no better or worse than he was before, but to a clueless audience like that, the approval of an official authority makes all the difference. So it's a harder problem than Hall realizes. The reason the young care so much about prestige is that the people they want to impress are not very discerning.
to overcome imposter syndrome, have confidence in your depth of curiosity rather than your expertise.
I like to think that William Blake summed it up nicely 200 years ago when he said:
"You never know what is enough
until you know what is too much."