There are many people who could help you deal with this. I hope you reach out. You should perhaps start with a rape crisis line or going directly to the police but I'm hoping you will first tell someone (an adult) who can help support you while doing this. As per your question - It is rape for several reasons - 1. b/c you are a minor 2. b/c you were drunk

Not to mention the offense of serving alcohol to a minor.

I'm sorry that happened. I hope you reach out to others.