It's our default mode--hoping that each day will be different while assuming (i.e. BELIEVING) that each will be the same (i.e. dull, bad, difficult, pointless, etc.). In this way of learned beliefs, growing up is a travesty. It robs us of that ability to wonder, FOR wonder. It teaches us that everything is hard--not only that, it teaches us that everything is of panic-level importance.
But guess what--everything is NOT hard and everything is NOT important. Some stuff just IS--it's neither good nor bad, difficult or easy. It just IS. And other things? They're marvelous--more often than not (Yes! MORE often than not), as long as we leave ourselves alone long enough to realize it.
Our strident inner taskmaster is learned behavior. And you know, we don't even need to un-learn it. We just need to forget it. To shrug it off. To invoke teenage rebellion against ourselves and invite in the little things--singing too loudly, dancing a little too wildly (or dancing at all, come to think of it), laughing too much. Take out the "too," and we cease to judge ourselves.
Imagine that--we cease to judge ourselves and just start to live. And have fun--the wildest concept of all.