Làjiāo shì wǒ de tiāndí, měicì chī le dōu nánshòu.
Chili peppers are my nemesis - I feel terrible every time I eat them.
Tips
memory
天 (heaven; natural) + 敌 (enemy) - a natural enemy, given by nature rather than chosen. Can be used humorously in everyday speech to describe things a person inherently cannot stand.
