YOU SAID:
I am alone in this world
INTO JAPANESE
私はこの世界で一人です
BACK INTO ENGLISH
I am the only one in this world.
INTO JAPANESE
私はこの世界で唯一の人です。
BACK INTO ENGLISH
I am the only person in this world.
INTO JAPANESE
私はこの世界で唯一の人です。
BACK INTO ENGLISH
I am the only person in this world.
You should move to Japan!