Think back to when you were a teenager navigating your first crush. Maybe you wrote your feelings down in a diary. Now imagine sharing those most intimate pubescent thoughts years later in front of a crowd of strangers. That’s the premise of “Mortified,” a performance series where people share their teenage letters, short stories, diary excerpts and even their AOL instant message chats. The show got its start here in LA and it’s celebrating its fourteenth anniversary this Saturday.