Doing so may happen in counselling or therapy or with a trusted friend or family member. The process is very individual and revisiting traumatic memories and graphic details of events can be very retraumatising. It is by no means a necessary part of the healing process. While it is generally important to acknowledge what happened and how it has affected you, this is different from drilling down into the details of your trauma.
Sharing your story publicly is a very personal choice, and definitely not for everyone. It takes great courage as well as good support and feeling and being safe enough to proceed. While more people are speaking of their experiences all the time, it is important that each survivor chooses what is right for them, at the time. No one should ever be coerced or feel compelled to speak out. That said doing so has been an important part of building community understanding and a sense of connection for survivors who have chosen to do so.
Revisiting traumatic experiences can throw people back so they feel as though the trauma is happening again in the present. Trauma, especially trauma from childhood has biological impacts on your brain and body.