In a word, most bad attitudes are the result of selfishness.
Anyone can steer a ship, but it takes a leader to chart the course
God gives us the vision, then He expects us to walk in obedience. As we do, the resources we need come to us.
Do something you hate every day, just for the practice.
It's said that a wise person learns from his mistakes. A wiser one learns from others' mistakes. But the wisest person of all learns from others's successes.
If people around you don't believe in you, if they don't encourage you, then you need to find some people who do.