(hello im 12 but this happend when i was 11 and for the sake of this i will call myslef frisk and my attacker joe)

so early summer 2016 me and my grand mother were going to this beach in ontario called st joseph's landing and i met a nice boy named joe he was large and tall for a 12 year old and he had bleached short hair, around the eight time i went to the beach with him at around 2 PM i had to pee so i went to the bathroom... he followed me and after i was done and had washed my hands he cornored me he was naked and hard and contuinued to beat and rape me (orally,annaly) but after he was done for some reason he got it in his head that if he touched my parts that it whould make up for it all,i stoped him by stabing him with a poket craving knife i onw (i stabed him on his shoulder) and ran awway to my grand mother who just knew that something horible had happend and help me through it and i still dont know what to do PLEASE HELP ME