my first car crash(even though it wasnt really a crash)

Yeah, so today I experienced my first car accident. It was a fender bender type deal. Here's what happened(by the way, it was my fault): I was pulling into the school's parking lot going to my parking spot and whatnot. Well, there was a guy in front of me who was backing up a little so he would have a better angle or something like that to get into his spot or he was backing up into his parking spot(i dont know exactly, he kinda disappeared the moment I looked away for a moment). Anyways, so since the guy in front of me backed up a little so I backed up a little. I had checked to make sure no one was coming before I started to back up, but while I was backing up someone did come up behind me and I didn't see that so therefore I backed up into the car that came behind me. Anyways, it wasnt bad at all. There wasnt very much damage at all and no one was hurt(I mean, I was going like two miles a hour). The only damage was to the other car and all I damaged was the front license plate. My car wasn't damaged at all. Yeah, so, I really am dreading talking to my dad in person about it.