I'm exactly the same as you. When I do have an inner voice it's essentially like talking to myself but without actually mouthing the words. But it's not present

I'm exactly the same as you. When I do have an inner voice it's essentially like talking to myself but without actually mouthing the words. But it's not present at all times, it's mostly there when I want it to. I can also create mental pictures in my head - but it's not like looking at actual pictures at all. I'm pretty convinced that it's possible that we actually all experience the same and just have difficulty explaining what our thinking experiences are like.