"What is this? An empty space? An empty world?
A world where nothing exists but myself?
But with only myself, I have nothing to interact with.
It's as if I'm here, but not here at all.
It's as if I'm slowly fading out of existence."
Without others to interact with, you cannot truly recognize your own image. In the act of observing others, you may find and recognize yourself. Your self image is restrained by having to observe the barriers between yourself; your self image is restrained by having to observe the barriers between yourself and others. And yet, you cannot see yourself without the presence of others. Because there are others, you can perceive yourself as an individual. If you are alone, then you will be the same without others. For if this world is only of you then there will be no difference between you and nothing.
By recognizing the differences between yourself and others, you've established your identity as yourself.