This song to me describes the living hell of suffering with mental illness, you lose control of yourself and do things you never thought you would be capable of doing - to yourself and other people. This song is like someone has gone through a suicide attempt ( "I cant escape this hell, so many times I've tried") and has lost grip on their self control and feel like a monster, an animal. Just like in the video where he smashes up the bar, some people get psychosis and lose grip completely and see monsters in themselves and the people around them.