YOU SAID:
My bro thinks I am stupid
INTO JAPANESE
私の仲間は私がばかだと思う
BACK INTO ENGLISH
My colleagues think I am stupid
INTO JAPANESE
私の同僚は私がばかだと思います
BACK INTO ENGLISH
My colleague thinks I am stupid
INTO JAPANESE
私の同僚は私がばかだと思います
BACK INTO ENGLISH
My colleague thinks I am stupid
That didn't even make that much sense in English.