YOU SAID:

I am the most disappointed person ever right now.

INTO JAPANESE

私は今まで最も失望した人です。

BACK INTO ENGLISH

I am ever the most disappointed person.

INTO JAPANESE

私が今まで最も失望した人。

BACK INTO ENGLISH

The person I was most disappointed until now.

INTO JAPANESE

人私が今まで最も失望しました。

BACK INTO ENGLISH

I was most disappointed until now.

INTO JAPANESE

今まで、私が最も失望しました。

BACK INTO ENGLISH

Until now, I was most disappointed.

INTO JAPANESE

今までは、私が最も失望しました。

BACK INTO ENGLISH

Until now, I was most disappointed.