YOU SAID:
I'm really looking forward to having pizza tonight.
INTO JAPANESE
今晩ピザを食べるのを本当に楽しみにしています。
BACK INTO ENGLISH
I am really looking forward to eating pizza tonight.
INTO JAPANESE
今夜はピザを食べるのがとても楽しみです。
BACK INTO ENGLISH
I am really looking forward to eating pizza tonight.
That didn't even make that much sense in English.