The purpose of this study was to clarify the relationship between adaptation-style and mental health. First, we tried to classify adaptation styles in young adults based on self-recognition and reflective self-recognition tendencies. In this study, two scales were administered to 560 people. These scales were "Over-adaptation scale "and "self-affirmation scale." When the styles of adaptation were classified using cluster analysis, 5 groups were extracted. Second, we examined differences in self-affirmation of the 5 groups. Results showed that the group of people with over adaptation in reflective self-recognition had a high tendency toward fulfillment, self-acceptance, and self-realization. On the other hand, it was revealed that the group of people with over adaptation in self-recognition had low overall self-affirmation. The results of this study suggest the effectiveness of considering not only self-recognition but reflective self-recognition when examining the adaptation style in interpersonal relationships of young adults.