If it helps any, I do the same thing to myself. I re-live incidents and episodes in my childhood (and, unfortunately, my adulthood too), in which I didn't conduct myself in the way, in retrospect, I wish I had. I never called it being evil. I call it being "horrid." Whatever descriptor you put to it, it is the same thing. As children, we were raised with the ever-present conditioning that we were damaged, sinful, evil, horrid (insert your favorite self-loathing term here, it works) human beings,...on the one hand. Then, on the other hand, we were conditioned to believe that we belonged to the only true religion. We were right, everyone else is wrong. Such a bizarre juxtoposition of contradictory positions...
Embarrassment, or shame, is not an unusual reaction in response to an outsider (walking into a kingdom hall, in a completely unorthodox context-as a rescue worker....) encroaching on our own private universe. The reaction of shame is to be expected when confronted with anyone who does not live in the same, conflicted, closed universe that we did. JWs are the masters of compartmentalization. When their JW lives interface with their "outside the kingdom hall" lives, watch out. Weird things happen.
To combat my feelings of truly being horrid, I have learned to review all the evidence in my life to the contrary. What takes practice is starting the review of unhorridness before I get too far into dwelling on the horridness. (That really is the trick.)
Take care with your heart, dude. Shoshana