Happiest there are hotlines you can call that could probably help you with your questions and help you through the process either way according what you choose to do. You really have to do decide what is best for you and understand where the choices you make will lead and how you will handle the fall out of those choices. Do you have a support system that will be there for you throughout the processes? That is a very important piece of the puzzle. No one should have to go through a difficult situation without a support system. MP was a young child when all this was happening and the community as well as the mechanchim in his Yeshiva should have been there for him surrounding him with support. They didn’t and he had to fend for himself at a very young age.
You are at a crossroads. Whatever happened to you is in the past, probably also at a young age. Now you are at a point where you need to decide what to do with the information that you have. If I am understanding you correctly, you are trying to decide whether to keep it to yourself or go to the authorities or even just tell someone else with authority. Maybe the suggestion is coming from your therapist, maybe from a friend. It could be coming from any direction. Maybe it is just your own “ying” and “yang” that is pulling you in two different directions. It takes time and courage to make that final decision one way or another. But it is very difficult for a victim of abuse to heal until they face their abusers and stop them from abusing, if that is your particular situation. No one can “tell” you what to do. No one has the right to do so. That is also abuse. You have the right to choose for yourself. You own your choices and you are in control of your own choices. So if you are ready and you have the support you can find the help you need to do it.