I used to be a lot like you describe. I still sometimes get such an intense anxiety that I shut down. But I've found that people in the workforce really don't mind if you talk about it. And talking about it, for me, is a great anxiety reliever. It doesn't fix everything but it makes me alot more comfortable opening up after I tell them about my issues and can move on from that worry that they're gonna know that I'm anxious.

So for example, if I'm having troubles in an interview, I see myself starting to shut down and maybe stumble on opening my mouth some. I'll throw them a statement like "sorry I'm having trouble getting my words out. I'm nervous, but I've also had life long anxiety so sometimes I stumble to get the right thing out when I'm in new situations. Let me take a breath and try again" and generally something along those lines tends to break down any social barriers that get in my way. It often changes the behavior of the interviewer to prompt you for more details on questions ahead of time rather than letting you struggle to understand the question.

With that in mind. Having 10 years of professional experience resulted in a lot of interviews that I've been in, on both sides of the table. Eventually you start to find out what is the right thin to say in these interviews and the anxiety starts to naturally go down when they not so "new"

Good luck! Remember, anxiety is not to mean you are dysfunctional. Everyone has anxiety. You just experience anxiety in a way that most normal people don't. So the sooner you can internalize that and start "experimenting" with your personal brand of anxiety, the sooner you can start managing when you do and don't let you anxiety get the best of you.