Digital technologies increasingly influence the conditions under which gender identity is explored, articulated, represented, and socially validated. Social media platforms, recommendation systems, gaming environments, avatar-based spaces, and online communities can expand opportunities for self-exploration and support while simultaneously exposing users to normative pressure, harassment, privacy risks, and algorithmic classification. This article examines the socio-technical mechanisms through which digital environments affect gender identity among adolescents and young adults. Methodologically, the study uses a secondary qualitative evidence synthesis of a 32-source thematic corpus published between 2021 and 2026, including peer-reviewed studies, systematic reviews, and analytical reports. Three additional publications on digital governance, migration, and human capital are used as contextual background and are not included in the 32-source thematic coding corpus. The reviewed sources are grouped by digital domain and coded across seven themes: gender exploration and affirmation; community support and belonging; stereotyping and appearance pressure; cyberbullying and discrimination; algorithmic misgendering and bias; privacy and context collapse; and institutional or policy responses. The findings indicate a predominantly ambivalent pattern. Digital spaces can facilitate safer self-expression, vocabulary development, supportive communities, avatar-based gender experimentation, and experiences of affirmation. The same environments can also intensify visual and behavioral norms, amplify restrictive masculinity and femininity scripts, increase exposure to harassment, and reproduce binary assumptions through algorithmic classification. The practical implications support gender-sensitive platform design, stronger moderation and privacy safeguards, greater transparency in automated profiling, and digital-literacy approaches that address algorithmic as well as interpersonal influence.