Everyone is obsessed with the "why." But the why is usually one of three or four things. The why can be for freedom, family, friends, or a better way of life.
Rather than searching for the why, I suggest spending time figuring out the "how." The how is the reasons, actions, and things that need to get done to make it. I suggest listening to podcasts like "How I Built This" or watching videos of David Rubenstein to learn how people made it. The more stories you learn about the how will make it easier for yourself to achieve success and enjoy the come up.