Existentialism

Existentialism is a philosophical movement which posits that individual human beings create the meaning and essence of their lives. It emerged as a movement in twentieth-century literature and philosophy, though it had forerunners in earlier centuries. Existentialism generally postulates that the absence of a transcendent force (such as God) means that the individual is entirely free, and, therefore, ultimately responsible. It is up to humans to create an ethos of personal responsibility outside of any branded belief system. That personal articulation of being is the only way to rise above humanity's absurd condition (suffering and death, and the finality of the individual).

From Wikipedia