Everything's an illusion.
But these illusions are still real experiences...
So you kinda are obliged to accept them as real or else there's no point in 
living anymore.

Tough luck, introspection will only give you intuitions about how it works. You 
would need to get out our own mind to describe its exact mechanism, which is 
physically impossible, in the sense you'd have to be irreversibly unconscious 
(pretty much dead, but death is not exactly the opposite of life) to experiment 
the solution to this problem. The problem is, since you wouldn't came back to 
life, there's no way you could share the solution with us.

Neurosciences are your only hope here, but what neurosciences describe is 
merely what every brain has in common, not exactly how YOUR brain works.