If you think the world is happy, look again . Look at the high rate of teenage suicides. We are in a position of blessedness and happiness that the world will never know. Success breeds happiness. The reason many people will not pursue meaningful challenges is because they are afraid to fail.
Failure causes one to be unhappy.
Failure for a Holy Ghost filled, spirit led saint, is just an event in life, rather than a way of life. We can correct our mistakes and go on to be happy in the Lord. See what God did for Daniel. What He did for Daniel as a teenager, He will do for you as a teenager or young adult. Read the entire chapter.