these kinds of what ifs can only go so far. just like the brain in the vat, you will never be able to prove you are a brain in a vat or that you aren't!

what is more important is to understand, is essentially, your consciousness is your only reality

the perspective of reality that your consciousness creates, is that little bubble of a world that you live in

the quality of the world that you live in depends entirely on that which you choose to be conscious of

the choice is yours!