No-one really feels self-confident deep down because it's an artificial idea. Really, people aren't that worried about what you're doing or what you're saying, so you can drift around the world relatively anonymously: you must not feel persecuted and examined. Liberate yourself from that idea that people are watching you.
But, then again, I had to stop because there was too much pain or too much trouble. After I retired I still had one more elbow surgery just to be able to do normal things