One of the reasons (I think) which make a writer so relatable is when you can identify with them: either personally or the work they produce! Some of my favorite writers are favorites because they bring their entire selves to a work.
What they are afraid of, I might be.
The things the protags have encountered that made them heroic. Or the villan that I root for because I, too, have been that hurt or mad.
The things found in memoirs or autobiographies which strengthen me to keep on own journey to either improve or let go of.
Bring that to the work! Bring it! Why? Someone whom reads it, might need it. More than you think, and sooner than they thought.