Part of it is looking back through rose-colored glasses. Sure, there was joy, but there was that time you stubbed your toe and you got so emotionally disregulated that you cried for an hour, or the time your parents put the wrong color socks on you and you screamed a bad word at them and refused to leave the house, or... etc.

You learned to regulate your emotions. That's mostly a good thing, but it also means that you learn to control yourself in the moment, and you don't tend to lose yourself in joy like you did as a child.

And that's OK. I enjoy things differently now, than I did then. Back then, when I played with a toy car, it gave me great joy but if something broke, or things didn't go my way, I also suffered uncontrollable anger and frustration. Today, when I take my TRX-4 trail truck out on the trails, I feel a different kind of joy that is mixed with intellectual understanding of the engineering of the machine, an appreciation of the beauty of the natural world that I didn't have as a child, etc. And if something breaks, it's not an emotional thing any more. I know I can fix it, I have the ability and the desire.

Heck, it's enjoyable to break things, take them apart, and fix them again. That certainly wasn't true when I was 6.