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.
If I could eat whatever I wanted every day, I would have Domino's pizza with pasta carbonara inside every slice. And at night, I would have Neapolitan ice cream until I felt absolutely toxic. And then I would drift off telling myself, 'It's going to be O.K... It's going to be O.K. you're going to train in the morning.'