I remember feeling exactly that way all through my teenage years and periodically since then. I felt like I didn't belong here, didn't belong now, or both. I felt connected to nothing and no one. Over all those years, I've come up with enough thoughts to fill a book, but I'll condense it here.
I think a large part of it is the abusers talking in our heads. They programmed us to feel this way because it keeps them safe from scrutiny, let alone accountability. After the abuse, they desperately needed us to keep quiet, and we kept quiet so that we could survive. And it goes beyond the abuser. The little towns I grew up in "were good places to raise a family". Things like that "don't happen here." Even if it did happen there, it was often swept under the rug. The culture of silence.
But now you're here where it's not just OK, not just acceptable, but its also encouraged to speak up. There's no culture of silence here. And here is where you belong. You fit in here.
This applies to me and maybe also to you. Part of keeping quiet and staying alive made me a chameleon. I could pretend to fit in anywhere with everyone even though I didn't. It's a way of being invisible, of hiding in plain sight. We're not noticed and therefore safer. But now, we don't need to fit in everywhere, we don't need to be invisible, and it scares the living crap out of us, because the abusers planted an idea in our brain that if we're not invisible we're in grave danger.
I'll stop rambling now. My point is that we / you don't need to fit in everywhere, it's OK to be comfortable in your own skin and it's safe too.