How do we know what we know are true?

There is no definite way to confirm that we know anything at all. Only from our direct experience can we claim any knowledge about the world. It is hard to imagine a world that exists outside of what we can perceive. Experience, however, comes through the lens of perception.

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Also, how do we know what we know?

There are several different ways that we know what we know, including informal observation, selective observation, overgeneralization, authority, and research methods. Research methods are a much more reliable source of knowledge than most of our other ways of knowing. Is color real or an illusion? Colour is an illusion, not part of the real worl. "Every colour that people see is actually inside their head and the stimulus of colour, of course, is light." As light pours down on us from the sun, or from a lightbulb in our home, objects and surfaces absorb some wavelengths of light and reflect others.

In respect to this, do we see with our eyes or brain?

But we don't 'see' with our eyes ? we actually 'see' with our brains, and it takes time for the world to arrive there. From the time light hits the retina till the signal is well along the brain pathway that processes visual information, at least 70 milliseconds have passed. Is time an illusion? According to theoretical physicist Carlo Rovelli, time is an illusion: our naive perception of its flow doesn't correspond to physical reality. He posits that reality is just a complex network of events onto which we project sequences of past, present and future.

Consequently, what is it called when you are in your own world?

A troglodyte is a person who lives all alone, in seclusion. You could call this type a "hermit" or a "recluse," but it's more fun to say troglodyte. How do I stop being in my own world? If you are fully committed you will be directly addressing the issue. So instead of asking others, go ahead and step boldly out of your own world into reality. Keep doing it in every moment for the rest of your life. This is the easiest solution for you.