How do you people share personal information with anyone in real life? (partly a phobia/panic and forced exposure management question)

Ok I figured I'd post this here since there's a quite the variety of things within just these subjects that seem pretty phobic for me and I can stay up for days completely messed up from the slightest overstep. Idk how to nuance the phobias (clinical settings, vulnerability, sharing, etc.), but managing one might be just as finicky and I assume most here are crafty on managing those things.
Expanding on one statement : How do you make guaranteed episodes of both panic and intense coping mechanism (forced exposure) less catastrophic and more accompanied/buffered socially? What are nuances you might think about for those needed encounters. (I've pushed the self reliance to insane extremes, so I mean in an accompanied/relational way, not with parts of 'me for now.)
[pasted from 2h ago: ]

[My brain's kind of broken right now since few hours ago (I can't recall) also and I was panicking and other things earlier. Pardon my poor English, and so on. I added the more direct contexts and hope someone has something to say that might mimic it or bring other subjects into the mix; as well as maybe going about angles I mentioned later, and more. Or just a sentence or 2 is fine. I'm trying to address it again and I'm desperate. My brain's not functioning right since few hours, so bear with me please if you want, I'd beg if it's ok]

I've probably formulated extremely well and explained extensively few issues and questions surrounding this 20+ times over the last years. I've spent the last 15+ years avoiding to disclose personal information with anyone irl; it went to some extremes once I was a teenager and accumulated personal/such issues. I've never been open with anyone irl. I've spent all my energy and time for the last 3.5 years now on only breaking mental structures that made sure no personal information would seep out by accident. I had literal suicide protocols and a lot of stuff like that and would spend literal months trying to break myself through stress, sleep deprivation and so on, so I'd make new fears and get in some survival mode easier. I could stay up 3-4 days often for few years just over these types of systems. Like I spent over 4 years on just that from 2014. I genuinely felt like multiple people and a team for this and in general since even before that. It's just a very serious minefield that ricochets on other sets of very intense issues, and it's not structured anymore; it's all entangled or completely loose associatively sometimes. And while I cry often about the very absurd amount of progress I've had, I'd still get extremely extremely wary and intense (unseemingly, if I can hide the stare) if I'm near any sort of gp or clinical people, among lots of other issues I'd have once that's resolved. Since my only life goal is to see a professional before dying, this is quite more important than my survival or responsibilities for me, though I do avoid it; sure that's something to delve into.

There's so much to reformulate about the initial question, and so many deeper problematics to bring into this, and I had made a thread here maybe 1-2 years ago, and many other places with more diverse details before that, but seriously I need to make sure a discussion starts and that I somehow address it with my very increasingly deteriorated grasp on all of this, so I can start actualizing and growing again. I'm not functioning ok 95% of the time, and I'm neither the masochist I was or the machine my body used to allow.

Everything's a veil right now, but please maybe give a reflection about your end on these things and on :

Sharing information, addressing new vulnerabilities, addressing assured but unpredictable terrors and assuring it's not catastrophic once any sparks off, seeing a professional of any kind for the first time

Treat me like I'm extremely young/intensely sensitive and tender; an extremely guarded teen/young adult or some sort of odd alien if you want. No other parts of my life have developed too normally, so discard any humanity there apart from base function of emotions, associations, cognitions, subconscious stuff and so on.

Sorry for not nuancing anything in this, it's just not working out and I've lost it so many times my mind's not caring or grasping things right in this realm, and I can't focus on anything since some time.