This is one of the reasons I never excelled at baseball. A coach told me multiple times not to think about the ball, just hit it. Don't over think it, just do it. That just doesn't make sense, of course I'm going to think about the ball!
On the other hand, I'm running a marathon in nine days. The fastest marathon I ever have run. The more I think about it the more nervous it makes me. Okay, I had some of the best workouts I have ever had, plus a cross country 8k PR going into this race, now we're not going to talk about it much. That way I can be more relaxed and less nervous, and hopefully enjoy the experience a little more. (I will blog more about the race leading up to it, but other than 15 minutes a day blogging about it, the point is I try not to think about it.)
The larger picture is, "who of you by worrying can add one single hour to your life?" There are many things you don't control, far more than you control, if you even control anything, so why spend effort focusing on those things outside of your control?
That baseball coach might not have been great at instructing me to hit the ball, but he did have a point. If thinking about variable X drives you crazy because you have no control over it, then don't think about it. If it happens, it happens.