It's worse falling into the state of mind that no matter what you do, you're insignificant and will be forgotten, and your existence in the cosmic scale means n

It's worse falling into the state of mind that no matter what you do, you're insignificant and will be forgotten, and your existence in the cosmic scale means nothing. OTOH, it's liberating, because you know your life is yours to live, it doesn't belong to history, or some nebulous legacy. Enjoy your life, good and bad, because it's the only one you'll ever have. The odds lucking out as a human were slim, as most lives here are microscopic and are not conscious enough to understand living.