Well, see, matter can, in fact be created and destroyed. This is because when you smash photons together really really hard, you get no more photons, and one matter and one antimatter. And if you smash matter and antimatter together (or even get them close) they become photons again. At least I think, take this explanation with a grain of salt. So physicists were like, when the matter was created for the big bang, there must have been equal amounts of antimatter and normal matter in the universe (Cause you can't really make new normal matter without antimatter) but when we look around our universe, we don't see antimatter, and we don't really know how we would detect it, so it could be there, we just wouldn't know.
And yes, I would love to!