Alice Cxx:
I know I'm new to this but is 2 large domino's pizzas and a small chocolate cake decent?
I'd say so. I'm actually amazed you can down all that at your size. I still can't eat an entire large thick crust pizza in one sitting, though I've been able to do if I eat some earlier in the day, and the rest later in the day. Thin crust pizzas are much easier, but that's less volume and mass.
Unless a "large" pizza from Domino's is smaller in the UK than it is in America. But even so, I think that's a pretty good sized order for someone of your current size.
Also moderately jealous, but also gratified that you're embracing this now. College offers an unprecedented opportunity to really get into this, because of the very high degree of scheduling flexibility you have. Alas, I denied myself for years, including college. While not impossible, it's more difficult when you're a bit older and have more demands on your time.