YOU SAID:

I don't understand why I have to do this but okay

INTO JAPANESE

なぜ私はこれをやらなければならないのかわからないが大丈夫

BACK INTO ENGLISH

I do not know why I have to do this, but it's okay.

INTO JAPANESE

なぜ私はこれをしなければならないのかわかりませんが、大丈夫です。

BACK INTO ENGLISH

I do not know why I have to do this, but it's okay.