只是恰逢少年愁
[zhĭ shì qià féng shăo nián chóu]
It means 'just coinciding with youthful sorrow,' reflecting that the user is undergoing struggles typically associated with growing up. Adolescence is filled with various sorrows and worries unique to young adults transitioning into adulthood; thus, these feelings are acknowledged without any pretensions but rather with simple recognition.