Africa does exist, I was born there and I've visited there a couple of times. I've once had an argument with someone online who claimed that I was never in Africa, and that the country I was taken to was just called Africa to fool me. I told him that even if the intent was to fool me, the place I visited every time that took 15 hour plane ride from North America to get to calls itself Africa, and a countries name is based on the powers that reside there. If Africa was fake, it would take a god to be able to hide the billions of people that live in that one continent away from the continent next to it, because if it isn't Africa, then it has to either be an unnamed continent, or a European continent.
Your question is very interesting, one might wonder if it was intended to be a dumb question lol, but it was fun answering it.