That's a common issue with self-esteem training, a prominent downside.

Self-Compassion by Kristin Neff is an excellent antidote to this.

Books that are about more well-rounded development of character strengths and virtues (positive psychology) tend to be better. There's some thought towards altruism, the greater good, feeling like part of something greater (secular or religious), etc. Self-esteem books are narrow in scope.