You are definitely not insane... you are a survivor. Sometimes when you open the 'closet', more comes out than you are willing to cope with. Telling about something that has happened to you means admitting to it, and sometimes the shame or pain is overwhelming.
It took years for me to be able to talk about some of the things that happened to me. It was too shameful because I blamed myself and I was afraid of the truth... that it had all really happened. But it has eased over time. I can talk about the things that happened to me now. But when you first start to talk, it is scary because you relive the abuse emotionally.
*big hugs*
You are strong. Keep talking. And remember, it was not your fault. You are not insane. You are healing.