When a man life becomes complete

Everyone was on a run for their life doing something they don't like. Also there may be no sense of satisfaction in their life. So I am thinking, what makes a man's life complete? Does the worldly things still matter for a man to make his life complete? Does only meditating makes a man complete? If there is no use in our life then what's reason for our existence. Why we came here into this world? Why are we in this cycle of birth and death? What is the meaning of life?