I am traumogenic (trauma created/clinical DID) plural system. It is highly likely that I never had a "core personality" that I was born as and instead have always had either an infant mental state or multiple personalities. (During the time most babies begin to form a coherent personality, I formed several. It is possible that not every system forms like this but highly like I did)
Every time I've felt I was singular, I've experienced mental walls, amnesia and other DID symptoms. If someone could do a "I'm singular ama" that'd be cool because I have questions too. :)
specifically its related to depersonalization so its more my personality gets erased for a bit. i got diagnosed with it at my psychiatrist office because it would happen regularly because discussing details of my trauma can trigger it sometimes, but it also has seemingly random triggers as well.