what if there is no 'everybody else' and that its just you in this reality and the rest aren't even real ?

René Descartes, the originator of Cartesian doubt, put all beliefs, ideas, thoughts, and matter in doubt. He showed that his grounds, or reasoning, for any knowledge could just as well be false.

Sensory experience, the primary mode of knowledge, is often erroneous and therefore must be doubted.

For instance, what one is seeing may very well be a hallucination. There is nothing that proves it cannot be.

In short, if there is any way a belief can be disproved, then its grounds are insufficient.

Everyone is in their own test tube, everyone is in their own 'matrix.' 

I've thought the same thing sometimes. Usually when I walk past other people's houses that are completely empty I think that it just hasn't been rendered because I didn't think of it.

I have found that my reality now is what I thought it would be 20 years ago.

 The trick is to think of a better reality.

No one can prove that's not the case. Of course, what does it matter? It's about as important as knowing if that rock's name is Bob or Ted.

That theory has been proposed, already.   Only it creates a world for ME.

EVEN MORE FUN---What if EVERY PERSON was YOU but in another lifetime?  You DIE and are born as someone else (but back in time)  so YOU are (or were) EVERYBODY in the world.---There is only ONE LIFE and it is YOU!

who the f*** are you? 

there would be no "we all" that are living anything, just you, all alone.

Well if that is the case then I'd better start imagining a nicer reality for us all.

then we might get lonely

lol i actually thought about that a few months ago, its weird to think about, i think its called soliphism or something . its also weird to think about, like, why was i born as me instead of everyone else i couldve been born as?