YOU SAID:
私にはあなた以外に友達がいない。
INTO JAPANESE
私にはあなた以外に友達がいない。
BACK INTO ENGLISH
I have no friends but you.
INTO JAPANESE
私にはあなた以外に友達がいません。
BACK INTO ENGLISH
I have no friends other than you.
INTO JAPANESE
私にはあなた以外に友達がいません。
BACK INTO ENGLISH
I have no friends other than you.
That didn't even make that much sense in English.