I disagree with JadeBear not fitting in. I have severe PTSD.
I have been more expressive here, and two other sites than I have ever been. It was a member from the 1st site that led me here. I visit all 3 sites.
It took me a long time to quit lurking and join. I still can't talk in person to anyone including my therapist, but here I can. That's my point, there are likely many others lurking. Your presence could give them the nudge to take that 1st step. You just won't know that until they join & are ready to express themselves.
My 1st baby step was reading posts and realizing I'm NOT the only one whose experienced trauma. I learned I'm not as I believed the ONLY one feeling, weak, ashamed and broken.
Now, I know I have more company than I would ever have imagined. Well that's just my opinion.