The person I once knew

The person I once knew that was filled with such life and promise died a long time ago.
I can't bring her back no matter how hard I try.
I have to move on somehow but I seem to be trapped between the land of the living and
the land of the dead.
I don't know what I am.
I still breathe but I'm so numb.
I feel pain but I don't cry.
Am I living death?
Or am I alive but dead inside?