Why being young shows that anything is possible

I wonder why people limit themselves so much. Just because something seems really hard doesn't mean it is impossible. When I was about 7 years old, I turned to my grandma and said,

"I want to buy this house and then build an amusement park with a bunch of roller coasters, and then I can be better than Six Flags."

The reason that this small account is so important to me is that I really believed that it was possible. I really saw a possibility in turning my house and backyard into a roller coaster. I even went so far as to draw paper blueprints of how it would be done. This was because nobody told me it was impossible. I didn't know about zoning, I didn't know that it would be prohibitively expensive, I just thought that my imagination could become reality. I suppose this is similar to Steve Jobs's behavior at Apple. His biography by Walter Isaacson references Jobs's "reality distortion field," the idea that Jobs could distort reality into whatever he wanted, at will, because he didn't limit himself to what the world thought was possible, but instead to what he thought was possible.

Anyway, to conclude my rant: everyone is taught "anything is possible," but only a few understand that impossible is just a societal construct. Just like landing on the moon: even if the math doesn't exist, even if nobody knows what to do, it is possible. You just have to never give up.