First is, Think Confident, Be Confident for Teens by Marci G. Fox and Leslie Sokol. Being a teen can be hard, and many times self-esteem takes a hit. This book is written to help teens understand why they feel the way they do, and what they can do about it. The book offers lots of questions and time for reflection in how to change "give-up thoughts into go-to thoughts." Go-to thoughts are the ones that recognize the feelings, but don't bring the person down. They offer a way out and an empowerment toward a stronger self-esteem. Included are several chapters with stories of teens and how they dealt with destructive thinking to become strong and confident.
The second book is, Your Brain Needs a Hug by Rae Earl. Who doesn't enjoy a hug? The first thing that stands out to me about this book, is the recognition that we are human and humans are not super heroes. We make mistakes and we deal with problems. This book takes a look at how the brain deals with a variety of mental issues. Chapters include anxiety, phobias, depression, OCD, and more. Illustrations keep the reading interesting and fun and the writing is conversational and relaxed. Maybe that's part of the point, relax - we're all human.