As I think about my happiness, I have to acknowledge that I'm competitive, and a perfectionist, and I hate the feeling of failure or making mistakes. But I also know that failure is a necessary part of creativity, of risk-taking, of aiming high. I remind myself that if I'm not failing, I'm not trying hard enough. Failure and imperfection are quite common (maybe you've observed this yourself), and if we aren't willing to make mistakes or to accept flaws or failure, we can't achieve much.
So one of my happiness-project resolutions is to "Enjoy the fun of failure." I really think that repeating this idea over and over has helped me to be more light-hearted about taking risks.