Keeping a journal is an awesome way to develop your character. It will help you see areas of your life that you need to work on and the great thing about a journal is that you can go back and see how far you've come!
My father taught me to be nice first because you can always be mean later. But once you've been mean to someone, they won't believe the nice anymore. So, be nice; be nice until it's time to stop being nice, then destroy them.