YOU SAID:
i dont know why im here
INTO JAPANESE
私はなぜここに私のことを知っていない
BACK INTO ENGLISH
I do not know why here about me
INTO JAPANESE
なぜ私はここにいるのか分からない
BACK INTO ENGLISH
I do not know why I am here
INTO JAPANESE
なぜ私がここにいるのかわからない
BACK INTO ENGLISH
I do not know why I am here
That didn't even make that much sense in English.