I do that, too. I think the more you practice that technique, the more it will help.

Your profile doesn't say how old you are. I'm guessing young for some reason. When I was in my late teens and twenties, my nervous system tended towards hyperarousal (I think that's what it's called). Always revved up, someone could say "boo" and I'd jump out of my skin.

I used to use exercise to help control my anxiety. It really can help quite a bit if you're physically able to do that.