Albert Camus’ Meursault found meaning to his own life. So did Sisyphus. And so did Izzy in the Last Kiss. And there may be no one single meaning of life that fits all. Not one single purpose for what we are doing on this planet alive.
But just like Sisyphus, who is sentenced to push a rock up a mountain over and over for eternity, meaning is found individually. And among that life, you can be happy.