The potential of the average person is like a huge ocean unsailed, a new continent unexplored, a world of possibilities waiting to be released and channeled toward some great good.
The only real antidote to worry or problems is systematic, purposeful action in the direction of your goals.
Being happy requires that you define your life in your own terms and then throw your whole heart into living your life to the fullest. In a way, happiness requires that you be perfectly selfish in order to develop yourself to a point where you can be unselfish for the rest of your life.
Do your very best on every task. Imagine that everyone is watching even when no one is watching.