Woulda-coulda-shoulda is a normal reaction to regrets--everybody does it. It's our way of trying to reassert a sense of control (real or imagined) over our lives. Of course, it's futile, because we can't change things that have already happened (or that didn't happen when they should have.) My dear old auntie, aged 83, died unexpectedly this past spring. I often phoned her once a week, but I hadn't done so, the last weekend before she died. See? Woulda, coulda, shoulda. Won't change anything.
As for CSA, I still get angry thinking of the things that OTHERS--responsible adults-- "shoulda" done when I became that Unhappy Camper. But all I can now is try to be the responsible adult that they weren't.