Let’s be clear: simply thinking about being more confident isn’t necessarily going to make it happen. That said, if you take it one step further and act in ways that a more confident you might act, there’s a fairly substantial body of research that suggests that you might get there.
Bulletproof Confidence: The Secrets of a Professional Poker Player
Zat Rana

Yes, this is the missing link to getting what you want. Your positive thinking should help you take action. If you don’t take action you miss it.