Hi there and welcome to the forums. You sound like you have some really great self-awareness which is cool. Have you actually got an "official diagnosis" of anxiety, or you've read about it and can relate? I ask this because I'm wondering whether you've sought any professional help at all? Or you're trying to self-manage at this stage? A psychologist can work with you to manage your anxious symptoms, and a gp can help with medication if you thought you wanted to go down that route. But you might think that's not necessary at this stage, and that's totally ok too.
Anxiety manifests in many ways, and I can relate to the symptoms you've experienced. I often blush, stutter AND get a facial twitch, but not when talking to everyone, on every occasion. And yes, I get a racing heart if I need to do some public speaking. What helps is to work on your anxiety in general.
So I'm not sure if this is the case for you, but as my psych explained, I always have a level of anxiety going on inside even if it's not noticeable to me. So it's like my body is on constant high alert and when something happens it hits overdrive pretty quick. Hopefully I've explained that adequately. So things like healthy eating (gut/brain connection), exercise, meditation, yoga etc are all things that are helpful in reducing our general anxiety levels.
So then we still have certain things that make us anxious, and we work on techniques to try and deal with those, as separate issues. For example if it's authority figures that make you anxious - have a think about why that is? And if your thinking about that is rational and warrants an anxious response. I realise you said you want to "stop thinking about it so much", but it's more about standing back as an observer, and observing our own thoughts, and perhaps creating new thought patterns that serve us better.
I hope this makes sense and is helpful for you. I'm sorry if I've just confused you and it sounds like gobbledegook. But I am happy to chat further or clarify anything if you like :)