"internal dialogue" is different to voices caused by psychosis!!
Having arguements with yourself is normal, having arguements with someone else who happens to be in your head is not normal

Its like hearing a voice but no ones in the room rather than just hearing your thoughts.
OCD is the recurring thoughts or compulsions not hallucinating voices! OCD can be anything from the stereotypical "handwashing" to lining things up, repeatedly checking things are locked, switched off etc, you have to do it but you dont necessarily want to do it or like doing it. OCD is about anxiety at the core of it.