Yes, very much so. I've known since school that something was odd about my movements and posture, because other kids would parody me as a joke/bullying, and I had a lot of trouble with school gym teachers and marching band instructors because I didn't move how they wanted. Back then, though, no-one had video cameras, so no-one could ever really get through to me what the difference was.
Much later, only a few years ago when friends started getting super-duper smart-phones, I saw video of myself. I found it really quite disturbing. It's not so much that I worry about other people's reactions, because I already knew about that; but when I see myself on screen, nothing I do looks at all like I imagine in my own head, and I stick out like a sore thumb. I can see now exactly why I'm so clumsy all the time, and it's no wonder I could never copy other people's movements properly. I see the same thing in my facial expressions; they're either much more subtle than I think at the time, or are really exaggerated (my eyebrows are nuts; Roger Moore and Mr Spock are amateur eyebrow gymnasts compared to me!) My mind just doesn't seem to perceive the difference between what I think I'm doing and what I'm actually doing.
My body image in mirrors is weird, too. It's as if my mind gets confused about whether it's controlling me or controlling the reflection, or which point of view to read left and right from (this is partly why I've nearly always had a beard!) I lose track of body parts when I'm hyper-focused or dissociated, as well. I'm used to these things, so they don't frighten me at all, in fact the mirror thing quite often makes me giggle; but I wonder if that is partly why I never recognised the oddness before seeing it on video. Something is very wonky about my proprioception in any case.
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When you are fighting an invisible monster, first throw a bucket of paint over it.