YOU SAID:
Myself my greatest enemy
INTO JAPANESE
私自身私の最大の敵
BACK INTO ENGLISH
I myself my biggest enemy
INTO JAPANESE
私自身が最大の敵
BACK INTO ENGLISH
I myself am the biggest enemy
INTO JAPANESE
私自身が最大の敵です
BACK INTO ENGLISH
I myself am my biggest enemy
INTO JAPANESE
私自身が私の最大の敵です
BACK INTO ENGLISH
I myself am my greatest enemy
INTO JAPANESE
私自身が私の最大の敵です
BACK INTO ENGLISH
I myself am my greatest enemy
That didn't even make that much sense in English.