I'm only just discovering this and it is extremely interesting.
I didn't know what "walls down" even was until recently when I had it explained thoroughly by a councillor. Since, I have been attempting to take some of the walls down and am frankly astounded at how cooperative I can be.
Nothing bad happened when I stopped completely shutting everything out. The world didn't end. In fact, good things have happened since and even people who have known me a short time have remarked on the difference, that I seem "more open." That said, though, discretion is well advised. With some people, mostly family, walls stay firmly up and always will. There is too much good reason to be very, very distant.
"Opening up" freaks me out a bit as someone who spent 30 years in complete lockdown, and that is my natural state, and I do have instances of feeling too exposed and pulling walls back up, but it is improving.
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Alexithymia - 147 points.
Low-Verbal.