YOU SAID:

I want to go use the bathroom

INTO JAPANESE

私はバスルームを使用して行きたい

BACK INTO ENGLISH

I would like to use the bathroom

INTO JAPANESE

私はバスルームを使いたいです

BACK INTO ENGLISH

I would like to use the bathroom.

INTO JAPANESE

浴室を使用したいと思います。

BACK INTO ENGLISH

I would like to use the bathroom.