Perhaps the most obvious is the fear that the writing isn't any good. We may not tell anyone and may defend our writing, but deep, deep inside, we sense our writing isn't good. The worse we feel our writing level, the more difficult it is for us to create words on the screen.
"If I writing something and people read it," my friend Rog Barnes once
said, "everyone will realize how bad I am."
"Or they might discover how good you are," I said, "and you are."
That happened in the late 1980s. To my knowledge, Rog has never published. He has surrendered to an irrational fear.
Serious writers face their fears.
Even if they think they're not good, they continue to write.