I've always wanted to upload my brain to a computer so I could have unlimited knowledge or rather that limited only by the internet. Just think if we all did that we would become the borg! Borg or matrix very little difference.
More like the copy of your mind would get to become the Borg. Your original, fleshy self would continue as normal.
A person can tell that they are themselves a thinking being. However, a person cannot tell that another has thought independent of their own. Even if I could somehow connect my brain to yours and see your thoughts, how would I know that your thoughts were not just extensions of my own, an illusion to make the world around me seem real?
https://en.wikipedia.org/wiki/Kaspar_HauserA kind of wolf-boy, who wasn't. Autistic perhaps?