Who am I

You greet me like you know me I don't think you do I don't recognise myself and I sure do not remember you I can see you, but I do not know your name Or your date of birth, Or from whence you came. You are a stranger to me, I do not recognise your face, Can you see right through me? Like a ghost that's lost its place on Earth and does not know the way to go. Why did you greet me as though you were a friend? Your mere presence is beginning to offend, The sight of you has confused me and I HAVE A SHARP PAIN IN MY HEAD Who is that lying next to you, Which one of us is dead?