YOU SAID:

i don't know why i am here wasting my time on such a stupid activity

INTO JAPANESE

私はなぜこのような愚かな活動に時間を費やしているのか分からない

BACK INTO ENGLISH

I do not know why I spend time on such stupid activities

INTO JAPANESE

私はなぜこのような愚かな活動に時間を費やすのか分からない

BACK INTO ENGLISH

I do not know why I spend time on such stupid activities