YOU SAID:
I need to become happier
INTO JAPANESE
私は幸せになる必要があります
BACK INTO ENGLISH
I must be happy
INTO JAPANESE
私は幸せに違いない
BACK INTO ENGLISH
I must be happy.
INTO JAPANESE
私は幸せに違いない。
BACK INTO ENGLISH
I must be happy.
You've done this before, haven't you.