Adolescence is a fundamental stage in identity formation. This study examines how different dimensions of the school climate influence the development of self-concept among Peruvian adolescents, all within the bioecological framework proposed by Bronfenbrenner. Using a cross-sectional correlational design, 224 students (50% female, 50% male; M=15.42 years) from a public school in northern Peru were evaluated in 2025. The School Climate Scale, the Garley Self-Concept Questionnaire, and a sociodemographic questionnaire were administered. A paradox was identified: a moderately adequate school climate (M=50.98±3.64) coexists with low levels of self-concept (M=123.87±20.56), particularly in the physical and intellectual dimensions. A negative correlation was observed between school climate stability and intellectual self-concept (r=-0.206, p<0.002), suggesting that overly structured environ...