competition...like it or not?

Im sitting here sick as a dog and so my mind is pretty useless and so I am listneing to two of my children. They are outside, one is drinking their drink and hte other is yelling "chug chug chug chug chug...." and I began to think on this. At first as I was listening ti struck me that that is such a weird game but on second thought, why on earth are they doing that? then I began to think of where learned it (school obviously) and i began to ponder that. why do kids think that they have to be that way? what is it that makes us so competitive with each other? why can't we accept ourselves and each other for who we are without always having to compete to prove that we are the best? i knwo that God wouldnt desire us to be so unsure of ourselves that we dismiss others and put them down in order to put oursleves up? is there something so inherently wrong with us taht we cannot accept us as we are? who put this in us?