I think the answer lies here .. 

"There is no material world, nor are there sensations, there is only one object and only one subject, the human observer. The observer is also an object and subject because what is observed exists only in the observer, which makes the observer the subject"

Where am "I" as opposed to "you"?  

Did you post here as a way to prompt your own thinking on this issue - as you are the only thing that exists and therefore anything we say MUST have come from your own mind .. 

Or are there really independent people who we can label "I" and "You" and "Him over there", and "Her over yonder"?

If there really is only the human observer, then who are you conversing with?  

And if there are other people, how does your epistemological approach prove that?  (hint: It can't).