Consciousness is the experiential quality of existence. It's whatever feels to be us. Consciousness operates with sensory inputs (images, sounds etc) ... but ultimately is a black box form a scientific point of view. 

But since each of this experience is fundamentally perso...

Accept them exactly as they are. 

Accept that they are unable to change, at least at this point in time. Unless you see real change — proof that this person is making an effort to listen and meet you halfway — you can assume that their behavior is what it has always been.

If we look at our dreams and the brain’s capacity to hallucinate, we can see that nothing outside our existence may be real.

Everything could be an illusion, a long dream, and we could be the only person that existed in a world of ‘Maya’. This is what solipsism is all about.