Once you realize that the outcome of most of the things you worry about don't change your life one way or the other, you can let go. Funny, it is usually other people's drama that "worries" me. My life is relatively drama free. Im learning to let go.
And people who call themselves nice aren't truly nice, they just act like it for self satisfaction. Ugh it just annoys me when people act so oblivious when clearly they are bragging or asking to get attention. To me the nicest and prettiest people are those who don't self proclaim it and don't seek confirmation from other people. Those things show through on their own.