This is something that is different to everyone - but for most new writers it's a stumbling block.
They don't see themselves as real writers. They put misconceived ideas on themselves, they are too critical of their writing and then comes WRITER'S BLOCK.
Real writers aren't like what you see on TV or in movies. They don't sit down at the computer and write a book in one sitting. Books aren't sent to a publisher two days before Christmas Eve and then magically on shelves the next day (only in Hallmark).
Real writers are people like you and me who WRITE.
Tell me what you thought a real writer was like to you, before you became one.