The teachers whom we remember with fondness and appreciation are those who pushed us, not those who pampered us. A demanding customer is rarely a pleasure to deal with, yet that customer can challenge the business to move forward. The experiences which cause us to grow are the ones in which we're challenged to push ourselves past our previously perceived limits.
Strength is built in response to challenge.
A bodybuilder must lift heavier and heavier weights in order to increase muscle. There is no other way. The more magnificent the accomplishment, the more daunting are the challenges which must be overcome. The challenges you face provide a pathway to excellence. They are difficult and they will bring out the best in you.