How can I prove you that I exist?

In short, I can't. After all, one of the great problems with modern Science is that we are limited to what we can see. We can't discover what we can't see and it has been scientifically proven that exactly the same parts of the brain light up when imagining something as when seeing that same thing in front of your eyes. For all we know this entire life we know could be a total dream invented by some sort of higher life form. We could be a more realistic version of The Sims for someone....