well you go to the ER and go up to the front desk and explain your situation. And a parent won't go with you? It's not that hard, and if it's too deep to get our yourself, you need to get attention, like, ASAP. Waiting only gives you better odds of an infection.

But it's whatever. That's what I'd do. Plus, how the hell do you plan on sleeping with that shard of glass in your arm?