Koyuki's worried about his future. He wants to be a teacher, but he's not sure he can do it.
mean so little that you're willing to 
give it up because you're worried
هيِّن إلى هذه الدرجة حتّى ترغب
في الاستسلام لأنّك قلِق
dass du alles wegen deiner Sorgen,
was andere über dich denken
significa così poco per te
che vuoi rinunciarci perché sei preoccupato
é tão insignificante para você
a ponto de pensar em desistir