We tend to judge an experience by the instant onset feelings and emotions that the experience brings. That is to say that even constructive pain can be perceived as something negative.
Remember that winning takes sacrifices, It takes pain, It takes heart ache, It takes the biggest toll one can ask of oneself. EMBRACE THE PAIN, EMPBRACE THE CHAOS! When one sacrifices so much to achieve a certain goal, only then will they know the true meaning of living.