YOU SAID:
I don't actually know why I'm here in the first place
INTO JAPANESE
私は実際になぜ私がここにいるのか、実際にはわからない
BACK INTO ENGLISH
I do not actually know why I am here
INTO JAPANESE
私はなぜ私がここにいるのか実際知らない
BACK INTO ENGLISH
I do not really know why I am here
INTO JAPANESE
なぜ私がここにいるのかは分かりません
BACK INTO ENGLISH
I do not know why I am here
INTO JAPANESE
なぜ私がここにいるのか分からない
BACK INTO ENGLISH
I do not know why I am here
You've done this before, haven't you.