Sure

How sure can you be now that you do not live in a future simulation of a historical 21st century?
Somehow it seems un-true. You know, like an intuitive gut feeling.
But surely you cannot be 100% certain. You cannot be 100% certain about anything.
Yes true.
So?
Well...if it is a simulation, then it’s a darn good one. I mean, what I am saying right now, what you are asking me, what we are thinking...it’s all part of the simulation right?
Yeah...there's a chance that it is.
But what if it isn’t? Isn’t it still a simulation in some sense?
Yes. The world that we experience is the world that we create.