Is it normal to eat cheese off of frozen pizza?

Well occasionally my mother works late, and doesn't want there to be dishes, so I'll put a frozen pizza in the oven for dinner if we're not too hungry. Well when I take it out and am waiting for the oven to pre-heat, sometimes I eat the cheese off of it (yes, while it's still cold). We have cheese sticks in the fridge, if I wanted cheese I could just eat some, but for some reason I only eat it off the pizza if we're having it. Maybe because it's already there, and I would've eating it melted anyway, so I figure I may as well... a few pieces won't hurt. But sometimes I can't control myself. Today I ate nearly all of it off! :( I feel like a bloated pig now. It was only a minute before my mom got home, so I had to take the cheese sticks out of the fridge and chop them up and put them on the pizza. I've done similar things with frozen chicken that has breadcrumbs on it, but usually just the pizza it happens with. Is it normal?