Do sit with that feeling of not being ready, and gently question it: not ready for what?
depression
#106: Writing Through Depression
Depression is a pack of lies layered over the core truth that you are a writer.
#37: When Depression Stops You from Writing
The way you feel isn't a rational response to a defined situation, and can't be evaluated on that basis. Feelings don't stay contained and orderly. Some of your feelings may not even be about your writing.
Story Hospital 