We do create our own reality, but there is a plane called 'template reality' in where universal laws are defined. There might be some universe where planets are cubes, pancakes, they might even look like a lollypop, but in the universe we live in the laws of gravity work in a way that our planets over time become sphrere. Grab a telescope and look at the moon, it's flat? No! And neither is our earth.

Seriously, some people go to far into the conspiracy theory realm.