Assaulted soldier

I went to a hotel with some of my battle buddies (army friends) and started drinking. This was couple months ago and I was underage drinking of course. I had sex with my now boyfriend. We said we will do it and agreed before getting drunk (it was his first time). I don't know why i t happened I blamed myself alot. But after we finished me and all my other friends passed out. One of my friends (a male) proceeded to rape me while I couldn't move from fear mixed with intoxication. I couldn't report it to SHARP because my friends would get demoted for underage drinking. I haven't had any signs of trauma besides mood swings fear and depression until recently my battle urged me to report it restrictedly so people won't get in trouble. I debated it in my head now I have nightmares. Flashbacks and I can't stand being around my assaulter at all. I don't know what happened but I'm getting worse. I feel like it wasn't a traumatic experience but the symptoms are getting worse I just try to push it away.