YOU SAID:
i will believe in myself
INTO JAPANESE
私は自分自身を信じるだろう
BACK INTO ENGLISH
I'll believe in myself
INTO JAPANESE
私は自分自身を信じます
BACK INTO ENGLISH
I believe in myself.
INTO JAPANESE
私は自分自身を信じています。
BACK INTO ENGLISH
I believe in myself.
That didn't even make that much sense in English.