It's half finished projects, starts that go nowhere, or finished work that no one gets to see because you don't think it's good enough. For some it can lead to real trouble with mental health and living a fulfilling life.
Imagine everyone sitting down everyday and diligently typing out their novels--hour after hour--with no breaks, no doubts, and no crumbs on the keyboard. Yeah sure! Makes me laugh...ha ha...writers don't really do that. Do they? Can they?