Pain evokes different emotions in different people. Even two identical events (pain) can evoke very different emotions in two different people. This stems from the parties' relationship with pain.
"You can't grow without pain, because no one evolves in a comfort zone." Reaching your goal without pain is impossible. Even if you do reach your goal, it's a fluke, and you'll quickly lose that goal.
We have a relationship with everything in our experience, even many of the things we have no experience with, or do not have. People with no money, still have a relationship with money. People with no love, still a relationship with love. It all affects our behaviours and thoughts. Pain is a pretty simple one to consider really.