If that's what you think, why aren't you living in a cave somewhere instead of posting on the internet?

The modern theory that it only developed ten thousand years ago is false.

Developed independently by geographically distant populations, systematic agriculture first appeared in Southwest Asia in the Fertile Crescent, particularly in modern-day Iraq and Syria/Israel. Around 9500 BC, proto-farmers began to select and cultivate food plants with desired characteristics. Though there is evidence of earlier sporadic use of wild cereals, it was not until after 9500 BC that the eight so-called founder crops of agriculture appear: first emmer and einkorn wheat, then hulled barley, peas, lentils, bitter vetch, chick peas and flax.

Side by side there have always been aboriginals. You can go to the Andaman and Nicobar islands even now and they are living like they did for thousands of years.

Today only the Sentinelese, who live exclusively on North Sentinel Island, have been able to completely maintain their independent state, resisting attempts to contact them. The Jarawa have also managed to remain substantially apart from the later colonisers and settlers; other Andamanese groups have had more extensive contacts, resulting in drastic reductions in territory and numbers, with several peoples becoming extinct altogether.

I wouldn't necessarily buy we just popped up in civilizations on this planet in the past 5 thousand years. What about all these underwater cities that have popped up in the past 10 years conventional science doesn't want to accept or explain?

http://news.bbc.co.uk/2/hi/south_asia/1768109.stm

Debris recovered from the site - including construction material, pottery, sections of walls, beads, sculpture and human bones and teeth has been carbon dated and found to be nearly 9,500 years old.

http://www.cyberspaceorbit.com/phikent/japan/japan.html

http://www.sptimes.com/2002/11/17/Worldandnation/Underwater_world__Man.shtml