And if someone managed to build a model of the human brain and "uploaded" your brain into it such that it acted identically to your biological brain, would you also consider that "you"? Are there two of "you" now?
Note: I'm not disagreeing with you, just kind of following the road your comment lays out.
Short answer: yes, as long as I'm unaware I'm an upload.
I was mostly trying to make the point how much of our existence is rooted in our senses. Even though we can meditate/daydream/dream/etc, most of it processes experiences already had.
I have no idea how a brain without any I/O would contemplate its existence, but I don't think our current psychological models apply.
Note: I'm not disagreeing with you, just kind of following the road your comment lays out.