My PTSD is also from childhood stuff and I did not tell my family about it. They do not think what they did was "that bad" so I am protecting myself from a dismissive (or worse) response.

When I first got diagnosed, I told a handful of people who I thought were close friends...who seemed uncomfortable with it. We've all since drifted apart. I also told my closest friend, who is very accepting and kind. She never brings it up, but if I do, she's great with it--i.e. If I say I need to leave a restaurant because my anxiety hit.

I would be much more cautious if I told anyone else about it now. Probably only if I had a significant other (not bloody likely!)