Openly list your strengths and weaknesses and how to reach your potential. Show only a positive personality. Never speak of anyone or anything in a negative way. Remember that when you smile at another person, they usually will smile back. Learn from your defeats.
Failure carries with it the seal of an open door opportunity to improve the next time.
If something doesn't work, figure out why and change it. We either grow from our mistakes or will always be a victim of our concerns. Trust your own judgement with a little faith on top. Improve your nonverbal communication. Read or listen to motivational speakers.