can bad posture make you mentally incapable

I must have taken 1000 yoga classes since I came to very similar realizations of the kind you are describing, and as a direct result of the "lighting up" effect from cannabis on my neuro-muscular system. It brought to the surface and continues to bring to the surface a lifetime of maladaptations in my posture, breath, and - I have come to believe - being.

I posted in this subreddit a while back on this experience - when it was more fresh to me - and the occasional comment still appears. The topic seems to connect with some people's experiences and when it does - it seems to sometimes cause surprise. I think that it is because that the experience of "unwinding" can go deep into the sense of self and its coherence. It has all but "forced" me to work with things that I would have otherwise avoided, as they relate to somatic areas, fears, and anxieties. When it feels like my rib cage has never not pressed on my stomach, and I recognize for the first time that after 40 years that this has been making me cranky and I can rotate into a new position of relief: it is fucking big deal for me.

This can also summon feelings of confusion about why no one cared enough when I was speaking about fascitis so painful that I could not walk, ages 11-14 or so. I was growing a lot then (I'm tall). But I also know that there is a hip hike and pelvic rotation that has been with me since early memory (I can see it in photos, and summon its effect in memory, too). I also know that in my deepest somatic recollection that the "soft" spot on top of my cranium - a presence since birth, it would seem, a slight depression - is the inner whirl of a ribbon of fascial wrapping that I can feel from head to toe. So, maybe someone dropped me or held me by a toe for too long.

The physio reworking for me has affected my sense of sight (less pressure behind eyeballs); taste (more awareness for what is also nutritional, along with fresh); hearing (my ear canals have opened up and a certain noise now reduced); touch (my finger tips were numb or disconnected at times); and also quality of thought. I was not getting enough oxygen.

I think that you have a great opportunity in noticing these things. If I can share a few ideass, I hope you will not be put off. What I learned is that this bodily experience can be disorienting and upsetting even (maybe my age amplifies this because of the unfamiliarity!). Having any kind of regular practice - for me yoga was idea - that is one involving a physical regime of any kind (e.g. walking) is really important. It can help to ground a person and provide a place for reference when other changes feel like too many emotions. A therapist who starts from this standpoint is one to appreciate, though there is also the route which I took - having a difficult therapeutic relationship - in which I was regularly expresing my anger - and showing it too. Whichever way to go, keep in mind that in this state of being it may be challeging to vocalize about internal experiences, for the simple reason that their validity may not be familiar. It can be scary trying to rework that situation, especially if one's body is already super tense and unfamiliar.

On cannabis, I had to figure out the ways that it can help, and that included mistakes which I think I could have avoided (a few uncomfortable dosages from edibles, panic ensues, etc). It's good to talk about usage sometimes with a trusted person who might also enjoy cannabis, or just learn about how to go slow, go low, and be gentle with yourself. Our society tends to encourage the opposite, and the promise of relief is itself very appealing.

On flexibility, you have a great opportunity to develop a practice of some kind and to use the awareness that you are building, for applied purpose. It can organize one's efforts and reward attention and training - which may be something that is missing from your current experiences, too, if you are like me. I have been long aware that my abilities to learn are no less and often more than other people's, though I avoid some things that are too much involving numbers, budgets, and technical aspects. I experienced stress and even fear on these topics as a child, though I also know that I can be logical and clear minded. I was always confused by the disconnection - whose way of interference was itself confusing - until I started to appreciate that thinking and concentration are muscle work. My muscles and skeleton only loosly relate to each other; I am literally disjointed at time. So is my thinking. In other words, the qualities hat resulted in me being ignored as a maybe gifted kid but maybe only dumb, quiet and fearful kid - who cares - in western PA in the 1970s - is the one that would probably have me medicated in the 1980s and 90s (Ritalin, Prozac) or amplifed in the 2000s (Ambien, study drugs), etc. I'm neither of those kids! I'm pretty "regular" as they go. However, I had a difficult physical experience already at that time - which I felt in my body - and which showed in different ways - which in their sum became heavier and worse over the next decades of lifetime. You are good to pay attention now. Best of luck.