This article explores the possible effects of group-based life design-related counselling on the sense of self of female adolescent peer supporters. Convenience and purposive sampling were used to select 24 participants at a private school (mean age = 16.5 years; standard deviation = 6.4 months). A parallel interactive mixed-method design, embedded in an intervention framework, was used to gather data. The Wilcoxon signed-rank test was used to compare pre- and post-test scores obtained on the Career Adapt-Abilities Scale and the Resiliency Scales for Children and Adolescents. Strong evidence of change was found on the Control scale (Career Adapt-Abilities Scale) and on the scales of Mastery, Self-efficacy, and Comfort (Resiliency Scales for Children and Adolescents). The results suggest that group-based intervention programmes, when based on self-construction and life design principles, could serve as a viable intervention process for adolescent girls during their discovery of a unique sense of self. Future research should focus on the question of sustainability of the newly gained sense of self due to participation in the life design-related programme.