Started new job, struggling with being social with coworkers

So for this new job we've been in orientation all week. Sitting in a classroom. There's like 5 or 6 of us and they're all yappers. I am not. I have to warm up to people before I'm comfortable really having conversations with them, plus I'm very new in my field and everyone else has already been in my field for a few years if not 10 plus years. I have chatted with them a few times and I have found it easier to chat when there's just one of two of them with me before everyone else comes back to the classroom, but once everyone starts talking again any time I try to comment I kind of either get ignored or maybe they just don't hear me talking.

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I'm not a hard person to get along with but I know my body language is showing my anxiousness and they all know I'm inexperienced at this line of work so I feel like they're judging me (I know that even if they are it doesn't actually matter in the long run) but once we actually start our jobs I know I'll be good at my job, which funny enough involves interacting with patients all fucking day lmao. I'm very good at working with people. I know my task, I know what I'm supposed to do, there's not a lot of nuance or social rules I have to worry about because it's a professional environment and I know how to act in a professional environment.

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Being in a group is a fucking nightmare lmao. I can talk so easily with one or two people.

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I'm also aware that I may be having some past traumas being triggered because of the classroom environment, and being "the new guy" and being the "quiet one" (I went to 12 schools in total growing up because I moved so much).

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I also have ADHD and am struggling to sit still at the damn desk all day, and when I was in school as a kid I would irritate my classmates with my constant fidgeting. Thankfully none of us in this class are enjoying sitting for so long so everyone has been getting up and standing and moving while doing the classes lmao.

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Idk where I'm going with this really, do I keep attempting to socialize with the coworkers? I already feel like an outcast but maybe that's just my own projections.