What he did was a crime. You should get help. I would recommend getting help from a rape crisis center (which I am sure you could find in your area). They will likely be able to provide counseling with understanding. Google "rape crisis" and you will find who is in your area. They will take you seriously and give you all the help and support you need.
You could also go directly to the police. Given your ages, what he did will be considered a crime. The police will probably not give you the support or understanding that you need.
If there is another adult professional, a school counselor or your doctor for example. This will also be a good resource.
Taking care of yourself if the most important thing. I would suggest finding a agency in the area that can give you support. They will know how to handle the legal side of things, but taking care of you is far more important.
Don't worry. People will take this seriously, especially given your age. You can get support and help.