Everyone has to find an answer to the meaning if life. For the non religious/escapist, you have to stare into the void and find an answer at some point.

Existentialism (Sartre) says you have to find your own meaning. Camus says there cannot be meaning; life is inherently "absurd".

Any of the existentialist philosophies will be adjacent to angsty teenager stuff; they dance closely with nihilism and cynicism.