who is this?

I look in the mirror But who i see isnt me. I dont know who it is, But i know its not me. Her eyes are blodshot, There is a lost, dead look hidden within. Walking through her days just trying to get by. No emotions, She looks like the walking dead. Thats not who i am, But she looks like me. She talks like me, But she doesnt act like me, Who is she?