I'm pretty much the same way. I'm not sure I'd say I exactly "hear" my "inner voice" but my thinking is definitely dominated by "spoken word" stuff.
Of course, I also talk to myself out loud sometimes, when working on a hard problem. Not sure how "normal" that is, but I can't say I really care a whole lot either.
i'm curious what happens in peoples minds when the sign goes from red to green at a crossing/signal. some people almost always need to hear a honk or someone moving ahead of them before they realise it's already green and being ahead means you may not get that visual cue you would if you were further behind.
it would be interesting to see what techniques f1 racers or 100 metre sprinters use to get their minds to tell their bodies to 'get off the block'.
Or you can turn it all off and focus entirely on your senses themselves. This can be interesting when, for example, you imagine something in contact with your body as a part of yourself. Do that to your car, for example, then you start to pay more attention to exactly how your wheels grip the road and you have a more intuitive feel for where every part of the car is in relation to you.
It gets tiring. Recently I've taken up drawing; when I draw my head is finally quiet.