Worse performance due to overthink definitely happens to me. When I tried controlling the valsalva maueuver(explained here: https://www.youtube.com/watch?v=ZT3l0FYJKns), I got so used to thinking about breathing that I actually started having trouble breathing. How to not think about your stuttering when you start to speak? I had put a lot of thought into this and I think being more spontaneous(I should've used this word yesterday) is a possible way. Everytime you want to talk, just say it. The analogy is supposed to demonstrate this, if you decide to be spontaneous, then you start halfway on the climb and you no longer have to experience the fear of climbing that you get at the bottom.