You're totally screwed. Not only did you total the bow but now you will surely flunk out of school and likely end up living on the streets.
Sorry couldn't resist. Just take it to a good proshop and they can get you fixed up, it won't be free ( I would guess @ $75.00 ) but unless there is limb or cam damage they can likely restring it back together. Those old bow were pretty tough. And then you can look back on this as an expensive lesson in archery. Never pull back a bow without an arrow and point it away like its a firearm.