Hopefully you've at least already realized that you did the thing were you put forth a problem you're sincerely struggling with (which makes people want to help you, as a basic emotional cause and effect) and then reply to every single good faith attempt to help you with varying degrees of bitterness, disinterest, and skepticism, which is not really kind or healthy towards anyone.
Anyway, it frankly sounds like you're really autistic. The rigid black and white thinking with no middle ground, the struggle to even fathom putting into energy into something you're not extremely intrigued by or find veey enjoyable, and the inherent confusion or repulsion towards doing something that makes your body feel "some type of way" all point heavily to that.
Working out hurts or aches even when you are used to it when you strain your muscles more than usual. Lying in bed rotting all day hurts (especially your hips) even when you don't have a connective tissue disorder. Those are just facts of being a human with a body.
There's a reason why autism is measured by how much support or help you need, and frankly it looks like you need more than you're getting. Either you get help to stop hating your body and accept it as is and just focus on the movements required for daily life + the stretches you already enjoy, or you get help in training yourself to help overcome the black or white thinking or at least, in some scenarious, to overcome your need to avoid physical discomfort over everything else in life.
Either way, even just getting help or being receptive to help is up to you. Literally nobody else can help you unless you're willing to try and you aren't. You refuse to accept the help from strangers on the internet--fair enough. But then maybe stop asking them when all you're gonna do is cross your arms and go "No! It's not a magic spell so I don't want it!" because not a single person is going to offer you a fix or a solution you like. And that's fine, if you just accept that.
Moving forward, I think maybe it'd be best for you to specify something like "I'm curious as to what you guys do to cope with this really frustrating thing, but I am not looking for advice, just your experience" and treat it like a casual conversation topic or discussion and not your personal game of "poking holes into other people's logic and experiences based in my own inherent hatred of the topic", or just say you wanna complain about it but don't want help. Because you clearly don't want help.
Regardless of how badly you've been handling some of these conversations, I do hope you're able to start hoping for and working towards a better wuality of life instead of focusing on resentment.
I know it's a nasty way of doing things, but I can't help doing it and also unfortunately it helps me. I can't catch myself doing it before I'm doing it, and even if I ever learn, I still wouldn't know what else I should be doing instead.
I don't have autism. I got tested twice for it and no matter how hard they tried to scrape together enough evidence, and no matter how badly they wanted me to have it, they could not find enough symptoms to diagnose me as autistic. I do have ADHD though, I never got tested for that as a kid and nobody even suspected it before I was in my late 20s and sought help on my own.
The problem with trying to figure out how to fix something is that I don't even know what the scope or nature of the problem is before people suggest solutions to a problem that's a different one than the one I'm struggling with. I'm not intentionally baiting people into wasting their time, it just genuinely doesn't occur to me beforehand to map out how and why the most obvious solutions aren't an option, because I didn't know what the most obvious solutions are.
If it's any comfort, I also hate it when I'm doing this.