This song could be about someone who has a breakdown or very serious experience of failure that shakes him and changes his view of himself. When the song references "you," it is referencing the previous, more confident and capable self, and when the song references "us both," it is referencing the old self and the new, broken self. He is struggling with who he used to be/who he wants to be, and who he's become (or at least the person he views himself as). Eventually (months; or, more likely, years later) he grows and reflects upon what has happened to himself, and how the world is a broken place in which very serious tragedies are constantly happening. He learns to embrace how life is difficult and hurtful, but also how everyone experiences life together and how he has to seek his better self by embracing all of life. By doing so, he is better able to find peace with who he is and who his ideal self is in his heart. The "ordinary world" is the state of being in which he is at peace with himself.
This song could be about someone who has a breakdown or very serious experience of failure that shakes him and changes his view of himself. When the song references "you," it is referencing the previous, more confident and capable self, and when the song references "us both," it is referencing the old self and the new, broken self. He is struggling with who he used to be/who he wants to be, and who he's become (or at least the person he views himself as). Eventually (months; or, more likely, years later) he grows and reflects upon what has happened to himself, and how the world is a broken place in which very serious tragedies are constantly happening. He learns to embrace how life is difficult and hurtful, but also how everyone experiences life together and how he has to seek his better self by embracing all of life. By doing so, he is better able to find peace with who he is and who his ideal self is in his heart. The "ordinary world" is the state of being in which he is at peace with himself.