I agree with greenfairy that why you didn't is a very personal reason, most likely.

I've told my mental health workers about my childhood sexual abuse, but only my husband knows out of my family. I also feel I would be somehow blamed, questioned excessively. I don't think I've worked through it enough to be able to talk about it openly, yet.

I can understand why you kept it hidden, many of us do. Only you know when you are ready...trust yourself. =)