Schizoid personality disorder. SPD is not the same as schizophrenia, although they share such similar characteristics as detachment and blunted affect.
There is, moreover, increased prevalence of the disorder in families with schizophrenia.[2] Some psychologists argue that the definition of SPD is flawed due to cultural bias: "One reason schizoid people are pathologized is because they are comparatively rare. People in majorities tend to assume that their own psychology is normative and to equate difference with inferiority". Therefore "[t]he so-called schizoid personality disorder is one of the more blatant examples of the APA’s pathologizing of normal human differences.
Invent.