Adolescents, especially high school students, are more susceptible to stress and encounter other mental health issues. This is linked to extrinsic causes like academics, family, and friends. However, previous studies have shown low rates of students seeking professional psychological help for their problems. This study investigate the relationship among factors including academic performance, educational stress, peer pressure and openness to seeking professional psychological help. We conducted this study with 471 high school students (grades 10–12) engaged. The questionnaire was based on three measurements: peer pressure short form (PPSF), educational stress scale for adolescents (ESSA), and openness to seeking professional psychological help (ATSPPH_O). The Mann-Whitney U test, Kruskal-Wallis test and The PLS-SEM method were used to evaluate this research. The results showed that: (i) students with a higher level of peer pressure have a greater openness to seeking professional psychological help; (ii) the more open to seeking professional psychological help, the higher educational stress that students got; (iii) students with a higher level of peer pressure have greater educational stress; (iv) the openness to seeking professional psychological help would mediate the relationship between peer pressure and educational stress; (v) there was a significant difference between academic performance of peer pressure. On the one hand, counselors, clinicians, and therapists must identify students who are experiencing educational stress in the context of peer pressure as vulnerable groups in need of early mental health interventions. On the other hand, educators and teachers must consider the impact of peer pressure on students' academic performance and devise appropriate teaching strategies.