Plz help me!!!!!!!!!!!!!!basically got d?

Well about a month ago me and my friend were alone at a bowling ally. I'm cryin rite now.Their was this guy there he was like 15 and he said he wanted to have with us and we were scared so we just listioned and he took us in the bathroom stall nd started taking off our cloths and we were jus like in bra and underwear and he like humped us kinna and I really don't wannna say anymore cuz I don't wanna tlk bout it me and my friend havnt told anybody and don't plan to, but we both havnt gotten our periods since making me 2 weeks late. I'm scared and don't know what to do....plz help! Btw I'm only 13