Hi Abigail,
Well, don't feel too bad. Some schools forbid (and prevent) viewing You Tube videos at school! The thing with You Tube also is controlling the content - sort of a version of video WiKipedia (reliance as to accuracy can sometimes be problematic. That said, there are certainly an abundance of resources potentially out there that could enhance the learning process. Perhaps you could arrange for a sharing protocol with other teachers or classes?
Barry Westling