I have a question about Schizophrenia

I've often heard (not sure if it's stereotypical or cliche) that people with schizophrenia do what the "voices in their head" tell them to... But do all schizophrenics feel compelled to "obey" to these voices...? I'd be so annoyed if some "voices" tell me to do something I'd probably do the opposite just to annoy them... So I don't understand... I get that voices appear, or "people" appear and they "talk" to the person... but does a schizophrenic always [i]has to[/i], or feels the need to, [i]obey[/i] the "voices"...?

I don't have schizophrenia and I know no one with schizophrenia so that's why I ask...