YOU SAID:

i am in a world which do not exists in reality

INTO JAPANESE

私は現実には存在しない世界で

BACK INTO ENGLISH

I'm in does not exist in the real world

INTO JAPANESE

私には現実の世界に存在しません。

BACK INTO ENGLISH

To me that does not exist in the real world.

INTO JAPANESE

私に現実の世界に存在しません。

BACK INTO ENGLISH

I does not exist in the real world.

INTO JAPANESE

私は、現実の世界では存在しません。

BACK INTO ENGLISH

I does not exist in the real world.