Ah, yes. You‘ll find your answers in Markus Zusak‘s book I‘m the messenger.
*Ed Kennedy (...), nineteen. Cab driver. No real career. No respect in the community. Nothing. (...) there were people everywhere achieving greatness. Well Ed - what have you really achieved in your nineteen years?'
This all changes one day when Ed stops a bank robbery. He begins to receive playing cards in the mail with addresses and names on them. Ed has messages to deliver. The tasks are not easy but it might just turn out that Ed is not as ordinary as he thought he was , and soon he will learn that greatness comes in all shapes and sizes.*
I absolutely loved I Am The Messenger by Markus Zuzak (2005). The main character ends up "finding himself" faced with a very unique problem, and it's not at all based on a certain philosophy. It's quite light hearted.
Steven Galloway's (2009) The Cellist of Sarajevo was also fantastic. It's told from multiple (fictional) characters' viewpoints as they survived during the siege of Sarajevo in the early 1990s, which inevitably leads to a lot of introspection from each one. It's less about "finding themselves" but that element is certainly there.