Is it obligatory to confess to friends about a relapse from repentance of masturbation, or is it better to conceal oneself, especially since they consider the questioner a role model?

He who repents of a sin is like one who has no sin. It is imperative to strive for repentance to Allah Almighty and to fill free time with beneficial activities, avoiding solitude and not dwelling on thoughts, seeking Allah's help. It is not permissible to inform friends about falling into sin; rather, it is obligatory not to publicize it. You should continue to advise and invite your friends, for your sinning does not justify abandoning the enjoining of good and forbidding of evil. As for your fear of their veneration of you, it can be remedied by knowing your true self and its shortcomings.