Any great achievement is preceded by many difficulties and many lessons; great achievements are not possible without them.
Persisting through lesser difficulties builds your capacity to persist through greater difficulties, and achieve even greater things.
After every difficulty, ask yourself two questions: 'What did I do right?' and 'What would I do differently?
For every difficulty that supposedly stops a person from succeeding there are thousands who have had it a lot worse and have succeeded anyway. So can you.
Your rewards in life will be determined by what you do, how well you do it, and the difficulty of replacing you.