Thank you all for sharing. I feel the same way. I guess the upside of hypervigilance and being forced into constantly changing situations and environments (15-20 schools, being sent away 7x, etc.) is that I learned early on to "read" people, so I am usually able to blend in at work, in social settings, etc. People will even describe me as "easygoing" and "extroverted" - lol! I am usually at war within myself.
I, too, often look at "normal" people - having parties, going to work, being generally at peace, just living life - and I am utterly baffled. I am jealous of people who have these magical friend groups...like, how? I make "friends" easily, but I let so few people in, and I'm terrible at keeping in touch with people. Once you're in my "safe person zone" (which is rare), I'll tell you what's going on, but I feel like the PTSD/pain I hold is so heavy and dark that no one wants to hear about that. When I'm doing well, I'm okay and can function. When it gets bad (like it has been for several months), I retreat and kind of fall off the face of the earth. Doing anything beyond what I have to seems to take monumental effort.
I often feel like some sort of alien who's become pretty good at pretending to be otherwise. It's been so, so hard lately. I moved to a new city a year and a half ago, so everything is still kind of new. I cancel plans a lot, and I don't feel like I can open up and say why I'm canceling, i.e. "My PTSD is bad, my EMDR session took it out of me, and I need to sit in bed and cry." And then I get angry at myself for not being "normal" or "just getting over it." It's really hard.