For all you know, you could be. You're just not aware of being me from the vantage point you call the brain of Qafka. Likewise, from my vantage point I'm not aware of being you. Just like if you cloned yourself, or if you had multiple selves in parallel universes (which you probably do--Many Worlds Theory is a very popular and the least convoluted interpretation of QM), but each instance of you is not aware of being each other instance of you, because your neural networks which house your experiences are physically isolated from each other. Sure, in the case of the clone or the parallel selves you happen to share an identity, but similarity of identity exists on a spectrum, and any place you'd draw the line between an identity being "you" versus "not you" is arbitrary, so the absolute truth is probably that there is no line.