Well, this is simply nonsense. An introductory anthropology class would tell you humans originally lived in simple, classless, effectively communistic hunter-gatherer bands, and only developed the distinct social strata, let alone "classes" in the economic sense, as agricultural and pastoral developments allowed a significant surplus to develop, and so an exploiter-class to appropriate that surplus. How could a tribe of Cro-Magnons, exactly, support a distinct ruling class, numbering only a few dozen and surviving at only a little above subsistence level?
Furthermore, a look at the history of various communist, anarchist and otherwise communitarian movements would demonstrate that social class is not the inevitably you declare. While it is certainly true that all generalised modes of production since the emergence of tributary societies in the neolithic have been class based, that does not suggest that the economic and political hegemony of a particualr class over another or others was a given. Who were the ruling class among the free workers of Anarchist Catalonia, I wonder? Who among the citizens of the Paris Commune, the inhabitants of the Israeli Kibbutzim, the 17th century English "Digger" communes? You need to read more, if you are to think about making such declarations.
But let me ask you, lover of the class system, even if we accept your claim that class divisions are "natural", why should we infer from that the idea that they are necessary or desirable, rather than merely being the odious condition in which we find ourselves? Surely, you see the current form of class division, one based upon property ownership, control of capital, and so forth, as preferable to that present in pre-modern societies, which consisted largely of an armed aristocracy that spent its time beating up peasants and taking their crops? So why stop there? What it is about this particular incarnation of class society that makes you feel it to be the culmination of human social development?