Confidentiality

So I was sexually abused a couple of years ago now and I try not to think about it. I have only told my boyfriend straight after it happened. I am only 15 and we had assembly at school where they spoke about it and told us to go to the head of student safety for help or if we ever need to talk. They then went on to say if they feel like we are in danger or the abuser could do it again they will have to tell our parents and contact the police. I was going to go to them just to have someone to talk to but I don't want them getting my parents or anyone involved as I feel like that would bring back too many painful things I have left in the past. I don't know what they are allowed to share and what they are legally allowed to say what I have said.