I'm currently on one of the 11 protagonists for a story I might be making, and I think I want them to have Quiet BPD. I've googled about it, but most websites didn't explain it well or didn't go in enough depth. I've seen the word "internalized" used a lot.

I figured since google hasn't been much help, and I want to show accurate experiences and give correct information, I'd ask people who experience Quiet BPD themselves!