I love math, and it always came pretty easy for me in school, until I hit calculus. At that point, my brain said "Enough!" For some reason, everything up until calculus just seemed like second nature to me- algebra, geometry, trigonometry... I loved them- still do.
Calculus just seemed like too much of a leap... I passed it with a B in college though- oddly enough, the part that my professor said was usually the hardest for students- sequences and series- was the easiest part for me. So I majored in accounting instead... with a concentration in finance, just so I could have some more hands on things with numbers. Time value of money, pricing bonds, duration, etc... for which the calculus I had came in handy- at least for grasping the theories. I would never dream of actually being a financier though- working as a broker or something along those lines... that would be way too high pressure of a work environment for me.