In our case....we endured our antogonistic abuser till we were 18 years of age, and quite a lot of splitting off we did...parts looking for identities.... I swear we had several parts growing up at the same time like multiple childhoods and aging...

But hidden parts layered in and buried...maybe triggered out by thought or sense...Idk...I often feel that there is more then you know or think.

Idk your experiences and length of circumstances....but after a lifetime of nonstop daily abuse...you are going to have a bunch of alters.