The Los Angeles Times reports that the Glee actress will publish Happy Accidents via Hyperion's smaller publishing imprint Voice in September.
The book will include recollections about coming to terms with her sexuality, kicking an alcohol addiction, and her time performing improv with Second City, as well as anecdotes about her past film and TV projects.
"If I could go back in time and have a conversation with my 18-year-old self, the first thing I'd say is, 'Lose the perm.' Second, I would say, 'Relax. Really - just relax. Don't sweat it,'" Lynch said in a press release on Tuesday.
"For a long time, I was anxious and fearful that the parade would pass me by, and that someone or something outside myself had all the answers."
She added: "Having finally reached a happy place - a happy accidents place - I want to share my story with others, to let them know things aren't as bad as they fear."