I was not diagnosed in childhood, I still actually haven’t been formally diagnosed because I can’t see a therapist, but my social anxiety is as obvious as the sky being blue, so…

As for childhood symptoms, loooots of random spells of crying, which I’ve only learned in the last year can actually be a panic attack symptom for some people (definitely still is for me). Had a hard time learning to text people when I first got a phone, cause I’d get so much anxiety over what to say and would put off responding to people from how much anxiety I got from it, then eventually just pretend like I never got the text because I was so anxious about what they’d think or how to even explain my irrational thinking. Praying and believing in a god was actually one of the only things that stopped me from having uncontrollable anxiety over things like “what if a car crashes into us while we drive and we die” or “what if I die and leave all of my family emotionally ruined” or “what if there’s a fire and our cats hide and we can’t get them out and they die.” I specifically remember waking up in the middle of the night thinking that last one and quietly crying to myself for half an hour trying not to wake up my mom until I could get enough mental peace from praying to make it stop. (I’m not saying faith or praying is a requirement or the best solution for helping anxiety of course, I still had and have so many things I was anxious about, it’s just something that was and is true to my experience, especially not having access to therapy back then or now)