Hmm.. Tough question, depends on your beliefs. If you're athiest, you most likely believe in science. Meaning, organisms are born as individuals so no one has the EXACT personality-some may look alike though. If you're a creationist, you could believe that there might be an exact twin out there somewhere.
As far as I'm concerned, I'm the only me-although, it's comforting to think there would be someone out there just like me.
All my friends are skeletons,
dulcimers and chariots
prayers to God, oh prayers to God
Was I sleeping all this time?
Was my shadow ever mine?Wintersleep-Danse Macabre