I’ve heard it said that the pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
Some people have undying optimism. I think that I do. But it can be dangerous. For one thing, it’s naïve. I think that sometimes optimism is partially the desire not to face facts, because facing facts might require action, and sometimes people have trouble with the action part. I do. Facing facts can mean admitting how powerless you really are. Sometimes facing facts means acknowledging failure. So you keep “trying”. You, or maybe I, keep seeing the glass as half full maybe because one of us is a coward?