This study evaluates the validity and reliability of a restricted structural model that brings together factors relating to online socialization, trust, and Internet dependency in junior high students. Its practical purpose is to explain the coherence and relevance of factors in the theoretical model by way of a multiple regression and correlation analysis. The sample was made up of 4,563 students from public junior high schools in Mexico. The factor analysis revealed that factors relating to online socialization and trust have a direct and indirect impact on Internet dependency in adolescents, which is consistent with the theoretical model proposed. The correlation tests showed convergent validity and high and significant structural coefficients. The results indicate that junior high students exhibit Internet dependency resulting from sociability processes not just with their peers and family, but also strangers, as presented in the model tested.