YOU SAID:

Whoa! Didn't know I had that in me.

INTO JAPANESE

うわあ！自分の中にそれがあったとは知りませんでした。

BACK INTO ENGLISH

Wow! I didn't know I had it in me.

INTO JAPANESE

おお！自分の中にそれがあったとは知りませんでした。

BACK INTO ENGLISH

oh! I didn't know I had it in me.

INTO JAPANESE

おお！自分の中にそれがあったとは知りませんでした。

BACK INTO ENGLISH

oh! I didn't know I had it in me.