YOU SAID:

i just suffocated myself with my pillow.

INTO JAPANESE

枕で自分を窒息させてしまいました。

BACK INTO ENGLISH

I have suffocated myself with a pillow.

INTO JAPANESE

私は枕で自分を窒息させました。

BACK INTO ENGLISH

I choked myself with a pillow.

INTO JAPANESE

枕で窒息した。

BACK INTO ENGLISH

I choked with a pillow.

INTO JAPANESE

枕で窒息しました。

BACK INTO ENGLISH

I choked with a pillow.