YOU SAID:

I think that if I were to not do it then I shouldn't do it because I'm not going to do it.

INTO JAPANESE

もし私がそれをしないとしたら、私はそれをするつもりはないので、私はそれをすべきではないと思います。

BACK INTO ENGLISH

If I don't do it, I don't think I should do it because I'm not going to do it.

INTO JAPANESE

私がそれをしなければ、私はそれをするつもりはないので、私はそれをすべきではないと思います。

BACK INTO ENGLISH

If I don't do it, I don't think I should do it because I'm not going to do it.