There is only one single "I". Your "I", my "I", your dog's "I", etc. are all identical. To a T. What's more, even though "I" can (from certain perspectives) appear separated (hence the illusory concept of personal soul or atman), it exists outside / prior time and space thus there is no separation to speak of since there cannot be separation without time and space (however, the sole concepts of "outside" and "prior" are, for obvious reasons, inconsequential from the viewpoint of "I"). And these are verifiable facts.