YOU SAID:
Do you want to eat pizza with me?
INTO JAPANESE
私と一緒にピザを食べたいです。
BACK INTO ENGLISH
Want to eat pizza with me.
INTO JAPANESE
私のピザを食べたいです。
BACK INTO ENGLISH
I want to eat my pizza.
INTO JAPANESE
私は私のピザを食べたいです。
BACK INTO ENGLISH
I want to eat my pizza.
That didn't even make that much sense in English.