The eternal diary

This is the story of a secret diary. The protagonist is approached by a stranger in a unique place. The protagonist somehow passes a test he didn't know he was taking and the stranger gives him a diary. The protagonist reads the first chapter and sees the story of man just like him. He writes about getting a strange diary and reading it. He writes about how he didn't know what the diary was but how his life really started to change and strange things happened to him. The protagonist read further back and further back, the stories crazier and crazier until it gets to the stranger who gave him the diary.