The Confidence Gap
Russ Harris's ACT-based guide to overcoming fear and self-doubt — stop waiting for confidence and start living fully.
Last updated 2026-06-26
If you have ever waited to feel confident before taking a step forward — and found yourself waiting a very long time — this book offers a liberating alternative. I recommend it to clients who struggle with self-doubt, social anxiety, or the feeling that they are not 'ready' yet for the life they want to live.
Who This Book Is For
This book is for anyone who struggles with self-doubt, social anxiety, fear of failure, or a harsh inner critic. It is especially helpful if you have tried 'positive thinking' or 'fake it till you make it' and found they did not stick. It is also valuable for people facing a big transition — a new job, a new relationship, or any situation that brings up feelings of inadequacy.
What It's About
Russ Harris uses ACT principles to challenge the conventional wisdom about confidence. The central idea is that you do not need to get rid of fear and self-doubt before taking action — you can feel afraid and still do what matters. The book teaches practical skills for making room for uncomfortable thoughts and feelings, connecting with your values, and taking committed action despite uncertainty. It is not about becoming a fearless person; it is about becoming a person who does not let fear make their decisions.
Key Topics
- The Myth of Confidence — Why waiting to feel confident keeps you stuck
- Defusion from Self-Doubt — Learning to hear your inner critic without obeying it
- Facing Fear with Acceptance — Making space for anxiety so it no longer controls you
- Values-Based Action — Identifying what matters and moving toward it, fear and all
- Building Psychological Flexibility — The real skill behind lasting confidence
Why I Recommend It
This book is a clear practical application of ACT. It offers tools for acting with courage even when fear and self-doubt are present.
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