I encourage you to name them. Say them out loud. Put your fears into words.
Because you know what?
There is a part of you that endures, dear writer. Richard Rohr calls it your immortal diamond. Another name for it is your true self.
It's the opposite of your ego. It has no fear. It's completely at peace and lives in ease and trust.
When the fears get named and brought into light, that immortal diamond part of you helps you see them right. It says, "Oh, that? We're not worried about it. That can't actually hurt us. We are utterly loved."
Can you name your fears about your book? And if you do, will you listen to your true self's response to them?