Borderline personality disorder is a severe disorder with distinct features which might be early identified in adolescence. Adverse experiences in childhood have been established as a risk factor for developing borderline features, and self-compassion has been proposed as a protective factor. This study aimed to test the mediation role of the self-compassion components in the relationship between recall of threat and subordination in childhood and borderline features. The sample was composed of 422 Portuguese adolescents (n = 249 females) with a mean age of 15.40. Girls exhibited higher borderline features, higher self-judgment, isolation, overidentification and common humanity. A mediation model to explore the role of self-compassion components explained 46% of borderline features, and both direct and indirect effects were significant, controlling the effect of sex. Isolation, self-judgment, and mindfulness were significant predictors. These findings showed which self-compassion mechanisms should be particularly cultivated, possibly having a positive effect for adolescents who had childhood experiences of subordination and threat and current borderline features.