Koyuki's worried about his future. He wants to be a teacher, but he's not sure he can do it.
You shouldn't let it bother you.
لا ينبغي أن تدع ذلك يؤرقك
Das solltest du dir nicht zu Herzen nehmen.
Que no te preocupe.
Pasa de ellos.
N’y prête pas attention.
Non dovresti prestarci attenzione.
Não deixe isso te atingir.
Так что не слушай их.