YOU SAID:

Oops, I guess Japan language isn't my first of what I do speak that I done did.

INTO JAPANESE

おっと、私がしたことは私がしたことの最初の日本語ではないと思います。

BACK INTO ENGLISH

Oops, I think that what I did was not the first Japanese I did.

INTO JAPANESE

おっと、私がしたことは私が最初にした日本語ではなかったと思います。

BACK INTO ENGLISH

Oops, I think that what I did was not the Japanese I did first.

INTO JAPANESE

おっと、私が最初にしたのは日本語ではなかったと思います。

BACK INTO ENGLISH

Oops, I think the first thing I did was not Japanese.

INTO JAPANESE

おっと、私が最初にしたことは日本語ではないと思います。

BACK INTO ENGLISH

Oops, I think the first thing I did was not Japanese.