YOU SAID:

i feel like i am useless and stupid

INTO JAPANESE

私は役に立たず、愚かだと思う

BACK INTO ENGLISH

I think useless and stupid

INTO JAPANESE

役に立たないと愚かだと思う

BACK INTO ENGLISH

I think it's stupid if it doesn't help

INTO JAPANESE

役に立たないとばかだと思う

BACK INTO ENGLISH

I think it's ridiculous if it doesn't help

INTO JAPANESE

役に立たないならばかげていると思う

BACK INTO ENGLISH

I think it's ridiculous if it doesn't help