Do you have a problem with unwittingly sounding angry? And how do you mitigate it?

Do you have a problem with unwittingly sounding angry? And how do you mitigate it? I suffer less and less from cluttering and stuttering as I grow older and slower, but I notice that the consonant-forward, diaphragmic, and measured flow I use to control speaking can be intimidating to many who don't know me, especially when I get excited – and the combo of having ADHD, and working in something that I have a burning passion for, means I'm excited a lot. When working with kids it can be advantageous (they do love them selves a boundary), but I find myself constantly embarrassed of how I come across when I talk with service or retail workers, e.g. Any tips and tricks?