This book is created for teenagers to help them learn how to manage emotions, accept the changes that are taking place in them and overcome the difficulties they face. Reading it, the teenager will master practical skills based on - psychological involvement, acceptance and responsibility therapy, positive psychology. They will help build a strong friendship, learn to cope with complex emotions, get rid of bad habits. This book will benefit not only adolescents, but also their parents, teachers, psychologists and coaches who work with them. A wide variety of exercises, stories and tests will help you understand yourself and learn to trust your own heart. By completing the proposed tasks, the teenager will learn to independently find a way out of difficult situations, build relationships with others and take care of himself. Being a teenager in today's world is not easy. Torn between school, family, friends and additional activities, you sometimes feel like you are being pulled in a dozen different directions, but you did not choose any of them. In addition, feelings of loneliness, depression and anger sometimes arise. And sometimes you wonder, are you good, smart and attractive enough to succeed in life? So how to stop doubting yourself and cultivate inner strength that will help you cope with life's difficulties and reach your potential?