Psychological research has documented it over and over again: most people (in the U.S. and Western Europe, at least) fall prey to optimism bias. They think a task will take less time than it actually will. They assume positive events (such as winning the lottery) are more likely than they actually are, and they underestimate the risk of negative ones. They anticipate that their future selves will somehow be more productive, happier, more responsible, and more consistent than their present-day selves.
I haven’t always fallen prey to this view..