How so? Genuinely trying to understand, as DID was formerly characterized as multiple personality disorder, and the way you describe your friends seem like it would fit (i.e. a dissolved idea of identity).

I know 3-4 people with schizophrenia, and none of them displayed the kind of wild delusions you're describing (though I am not discounting them! Don't get me wrong). In my experience schizophrenia manifests itself more like a worse form of anxiety, paranoia and depression mixed together (all my friends are under treatment and medicated).