YOU SAID:

I found my friends, they're in my head.

INTO JAPANESE

私の友人を発見した、彼らは私の頭の中。

BACK INTO ENGLISH

They have found a friend of mine is in my head.

INTO JAPANESE

彼らは私の友人が私の頭の中を発見しました。

BACK INTO ENGLISH

They are a friend of mine found in my head.

INTO JAPANESE

彼らは私の友人が私の頭の中が見つかりました。

BACK INTO ENGLISH

They found a friend of mine in my head.

INTO JAPANESE

彼らは私の頭で私の友人を発見しました。

BACK INTO ENGLISH

They discovered a friend of mine in my head.

INTO JAPANESE

彼らは私の頭の私の友人を発見しました。

BACK INTO ENGLISH

They discovered a friend of mine in my head.