I don't have an inner-monologue and never realised that some people do. My thoughts are rapid, abstract and conceptual rather than verbal.
For example, if I am thinking that I'm hungry and want to start making dinner it takes the form of something like: concept of hunger+concept of dinner+concept of it being the evening/dinner time. After speaking to my family members they would have an inner-voice that actually says "I'm hungry, I think I'll go start dinner".
I have also always been confused about the idea of having an inner-critic that berates you. I've never heard an inner-voice say, for example, "nobody cares what you have to say, don't bother speaking, everything you say is stupid", instead I would just feel the sensation of shyness and wanting to stay quiet.
I can make myself have an inner-voice and I will use it occasionally, for example if I'm trying to remember a particular phrase or something but my default thinking is not an inner-monologue.
Which kind of thoughts do you have?