Your teacher is right, you really shouldn't worry, but I know that you will anyway. Her casual attitude is a little concerning though.
1. It was a subQ needle, therefore, tiny bore, possible microscopic blood-no blood at all.
2. You admit that it was more scraped on your hand as opposed to stuck in your hand, therefore "microscopic blood/no blood" never had contact with your blood, tissue, ect.
3. Hep C, is definitely transmitted way easier than HIV, But "way easier" means that if you had a large bore needle filled with contaminated blood, stuck way into your hand...you would have a 1.87% chance of contacting it, Hiv would be 0.3% in the same scenario...so yes, way more virulent, but still not very easy to get from a "stick"
1.87%........Hep C, may be hardy, but it requires a decent amount of virus to be injected
into your body AKA blood transfusion, dialysis, needle sharing...This virus actually can't really spread as an STD...think about that!
4. You have the lowest possible type stick my friend, so sleep easy at night, but in the meantime, get yourself to the schools wellness center and have yourself tested now (for a baseline) and in about 3-6 months, this serves to make you feel better, and it will!
Not sure if you read my story, but I consider my self pretty educated on this topic now. I have been conversing a lot with one of our ER docs who stuck himself deep with a contaminated central line years ago....very smart guy, and we are now friends and experts
You can PM me if you'd like