Things We Enjoy

I was thinking the other day "Why is it that in everything we enjoy to do at some point it will be difficult?" I mean if we enjoy it how can it ever be difficult. Shouldn't our enjoyment of the action make us not notice the difficulty. One example that is  pretty common are sports. I personally enjoy playing basketball but do not have a natural affinity to it. Even though I enjoy playing at some point I will have to work harder and harder if I wish to continue to play or excel Well I think i just found the answer, if you enjoy doing something it will only get difficult if you wish to excel at it.I really love math but Calculus 2 is extremely difficult and I need to just suck it up because I want to excel in what I enjoy.