Notes and Reflections on Books and Media
by Hannah Leitheiser
Robert Stawell BALL
'Isaac's first incentive to diligent study seems to have been derived from the circumstance that he was severely kicked by one of the boys who was above him in the class. This indignity had the effect of stimulating young Newton's activity to such an extent that he not only attained the desired object of passing over the head of the boy who had maltreated him, but continued to rise until he became the head of the school.' -- Great Astronomers
So, basically, you have bullying to blame for the existence of calculus.