Politeness is okay, but it gets old and boring. You want to attack life with a passion, not a politeness, you want people to think about you and remember you and say "she is so passionate" you don't want people to think about you and remember you and say "she is so polite," because, who cares about polite?
All you know is what you think you know, but that isn't always what's real.
Without living, there will be no learning. Without learning, there will be no growth. Without growth, there will be no change. The only way you learn is by trying. You may make mistakes but you have to remember that doing so will lead to change. Be willing to learn from experiences, grow and live to become better not bitter.
Focus on making yourself better, not on thinking that you are better.