By analyzing 318 Reddit posts from adolescents aged 13-17 describing their dependence on AI chatbots, we found that AI chatbot use can disrupt offline daily life. While adolescents initially use chatbots for support or creative play, this can lead to strong attachments characterized by conflict, withdrawal, tolerance, relapse, and mood regulation. This can result in problems such as sleep deprivation, academic decline, and difficulties in real-world relationships. Adolescents tend to discontinue chatbot use when they perceive harm, re-engage in offline life, or experience changes in platform constraints. Furthermore, we highlight specific risks of character-based chatbots from an adolescent perspective and propose a framework (CARE) for designing safer systems.