53 optimism, 75 faith, and 46 logic!
In Greek mythology, a man named Sisyphus had angered the gods during his life. When he died, he was sent to Hades, and punished by constantly having to push a boulder up a hill. Every time he reached the top, the boulder rolled back down to the bottom and he had to start over. This process repeats itself for eternity.
That's more or less how existentialists view life. We're much like Sisyphus - struggling to push a rock up a hill, knowing that even if we succeed, it won't matter. No matter how great our achievements may be, in the end, they're completely meaningless. But like Sisyphus, we should continue living our meaningless lives, in order to defy whatever force is punishing us.
Famous existentialists include: Albert Camus, Friedrich Nietzsche.
The opposite of Existentialism is Rationalism.