<![CDATA[ABSTRACT This study aims to examine the empirical effect of TikTok usage intensity and exposure to self-diagnosis content on adolescents' self-perception among Islamic boarding school students (santri) in Tuban, East Java. A quantitative survey design was employed, with 100 respondents aged 15–17 years selected through purposive sampling based on their active use of TikTok. Data were gathered using validated Likert-scale questionnaires and analyzed using multiple linear regression supported by SPSS version 27. The findings indicate that TikTok usage intensity and exposure to self-diagnosis content simultaneously exert a significant effect on self-perception (F=90.235;p<.001). Partially, TikTok usage intensity (t=10.087;p<.001) and exposure to self-diagnosis content (t=2.212;p=.029) positively and significantly influence students' self-perception. The coefficient of determination (R^2) of 0.650 indicates that 65.0% of the variance in self-perception is explained by both independent variables, while the remaining 35.0% is governed by external factors. These findings highlight the necessity of structured digital literacy programs and verified psychological education within Islamic educational environments. ABSTRAK Penelitian ini bertujuan untuk menguji secara empiris pengaruh intensitas penggunaan TikTok dan paparan konten self-diagnosis terhadap persepsi diri santri di Kota Tuban, Jawa Timur. Pendekatan kuantitatif dengan metode survei diterapkan kepada 100 santri berusia 15–17 tahun yang dipilih menggunakan teknik penarikan sampel bertujuan (purposive sampling). Pengumpulan data menggunakan kuesioner berskala Likert yang telah teruji validitas butir serta reliabilitasnya, kemudian dianalisis menggunakan regresi linear berganda dengan bantuan SPSS versi 27. Hasil uji simultan menunjukkan bahwa intensitas penggunaan TikTok dan paparan konten self-diagnosis berpengaruh signifikan terhadap persepsi diri santri (F=90,235;p<0,001). Secara parsial, intensitas penggunaan TikTok (t=10,087;p<0,001) dan paparan konten self-diagnosis (t=2,212;p=0,029) terbukti berpengaruh signifikan terhadap pembentukan persepsi diri santri. Nilai koefisien determinasi (Adjusted R Square) sebesar 0,650 mengindikasikan bahwa kedua variabel bebas memberikan kontribusi efektif sebesar 65,0% terhadap variasi persepsi diri santri. Temuan ini menegaskan pentingnya kurikulum literasi digital dan penguatan bimbingan kesehatan mental di lingkungan pesantren guna memitigasi distorsi kognitif santri.]]>
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