Life is awesome - argumentum ad populum

[Vaginasaur]

There's nothing deluded about enjoying existence.

You can enjoy existence, but you also have to recognise three psychological mechanisms which give you your optimistic outlook, the Pollyanna Principle, the phenomenon which might be called adaptation, accommodation or habituation, and the implicit comparison with the well-being of others.

Being pessimistic does not detract from the so-called joys of life.