Many people think before they speak. Some didn't think about what they are speaking. The words can make you, break you, they can heal your soul they can damage you forever. So always try to use positive words wherever you go. Your words, mixed with your beliefs, blend to become your reality. What you speak over your life is what your life will become.
Instead of saying: I'm a failure
Say: yeah, I've failed...I've learned the lesson, and when I become a huge success that failure is going to make for one hell of a story.