How to stop caring about how I come off ?

So I’m scared that I might be coming off as weird to other people and I might either have adhd or if not that probably on the spectrum. I’m scared that my facial expressions might be weird or that the way I walk or stand is weird and that other people might be judging me. I feel like me caring about how I come off probably makes me come off as weird to other people. I do notice that when I’m not anxious and when I’m mentally calm i act more normal and I don’t come off as that weird but it’s when I’m anxious that makes me probably come off as weird. How do I not care about how I come off and just be confident within myself ?