Can I get an STD through oral?

I've hardly kissed guys before and im 16. all of the sudden i got a boyfriend and he forced me to give him a BJ. I have cuts in my mouth from braces (i know im old for them) and someone told me that I can get an STD by doing this. I swallowed and everything...please help. If he's 16 and has hardly kissed girls before too...he probably won't have any STDs to give right? or is it a hereditary thing? please helppp! i cried all last night.