The Drowning Season Sue Townsend 99. The Secret Diary of Adrian Mole Penelope Mortimer 100. That is the preliminary culling. It gives us, at least, a starting point. An equally long list could be made of memoirs, poems and novels in languages other than English.
All lists are highly arbitrary.
And this, like all such efforts, is a work in progress. This exercise may turn into a publishing project, so I hope to be as inclusive as possible. Ranking the listed books seems to me like a useless exercise. Books are not prizefighters. They don't compete against one another.