At first, I was puzzled by the meaning of this song. It just didn't make sense. But I think I'm starting to put the pieces together now. In my opinion I think that this song is about a person drowning in their own pool of lies. "Hearing your words out of my mouth" based on my guess, I believe that this line means that your living another persons life, your following someone elses rules and not your own. "Return all of this to sender. The mirror spoke to me and showed. All of this pretending is catching up to me." Following up, this means that the person whom the song is about is finally making a decision to live his own life and is returning all what wasnt his back to who was playing his life. The mirror is symbolzing his innerself, a sign of rebellion that he needs to break out because all of the lies about himself are starting to take over.