YOU SAID:
the girl who is sitting next to me is a loser
INTO JAPANESE
私の隣に座っている女の子は敗者です
BACK INTO ENGLISH
The girl sitting next to me is a loser
INTO JAPANESE
私の隣に座っている女の子は敗者です
BACK INTO ENGLISH
The girl sitting next to me is a loser
That didn't even make that much sense in English.