I think we do not understand objective reality well, but we live in a model of the world that our brain has constructed from each ones personal experiences, destiny and genetics.

The world of a child, a teenager, and a thirty-five-year-old person is different.

You live in your model of the world, not in the world as it truly is.

It takes hard work, deep understanding, and conscious self-refinement to comprehend pure reality as it is, at least at its most basic level.