i cant tell you why ..........your ...........alters wont take control and whether they are living in a virtual world and whether or not they are parasites.

what I can tell you is there are many different kinds of alters. Dissociative type alters are a very special kind. they dont enter a body like spirits and ghosts. in fact there is a diagnostic criteria that says the problems can not be because of religious practices (here in the USA ghosts and spirits are part of religious practices)

Dissociative alters are the kind that are linked to dissociating. example in order for my dissociative type alters to have taken control I would have had to be triggered by something, then because of being triggered my brain did its dissociative process of flight/ fight response making me feel numb, spaced out disconnected. then which ever alter who's sense of agency (a new diagnostic term for dissociative type alters) was to talk care of that trigger would take control to handle that situation or emotion for me.

when my alters didnt take control any more that meant 2 things... 1 that I was perfectly capable of handling my triggers and life so that there was no need for my brain to do the dissociation process. that it was time for me to handle my own problems. and 2 because the alters were no longer there as separate identities stored in my unconsciousness.

DID was not some thing that I could choose to be and I could not control whether my alters from having dissociative disorders would take control when and which one. for me it all worked on the fact that I had a dissociative disorder and my triggers caused me to dissociate/ have my dissociation symptoms which in turn caused my dissociative alters to take control.

like I said there are many different alters. example with my bipolar disorder anxiety disorder and so on I had psychotic induced alters, medication induced alters......these too I could not ask them to take control they were not spirits and ghosts that you see in movies jumping into peoples bodies.

my suggestion is if this continues to bother you talk with your treatment providers. they will be able to explain in more detail about various kinds of alters, which kind you have and in turn answer your questions as they pertain to you and your belief system / culture and so on.