why do I feel in pain? =내가 왜 고통 받아야 해? =내가 왜 아파해야 해? =내가 왜 괴로워해야 해? This expression is normally used in argument between lovers, as far as I know(?)^^ Sorry, I don't know its pronounciation written in English.

i think you can just say 아파요./? (apayo) I will write what Guri wrote with the english pronounciation why do I feel in pain? =내가 왜 고통 받아야 해? (naega wae gotong badaya hae) =내가 왜 아파해야 해? (naega wae apahaeyo hae) =내가 왜 괴워해야 해? (naega wae gwiwohaeta hae) ^--^