I've been seeing a lot of posts lately about anendophasia (no inner voice).
First of all, the posts I've read have been weirdly judgemental about it, and often describe it as "not thinking". I just think that's a bit unnecessary.
Also, I find it interesting, because I *can* have an inner voice, but it's intermittent, and almost always for the very specific purpose of putting words together write, explain something, or make a phone call.
Usually I think in what I have learned is called "maladaptive daydreaming". I see why it can be maladaptive - because daydreamers often loose track of things. But this is how I process things. I'm an observant maladaptive daydreamer. I watch people in my mind interact. They have stories seperate from my real life, but they relate to things I need to think through.
If I'm doing something, like grocery shopping, or painting, I'm just there. I'm not NOT thinking. I'm just not verbalizing thoughts in my head.
Everybody's different. I love how different we all are.