If I'm sitting? I cross my arms. Almost ALWAYS whenever I'm nervous. Every interview I've been to, I'll cross my leg over the other, sit back, and end up crossing my arms as well

I get nervous really fuckin' easily.
In college, I'd get stressed as hell over every test, to the point of essentially shaking whilst seated. When I was on my feet, I'd have to pace or something.
Most recently, I notice that whether it aches or not, whenever I'm nervous, I'll reach up and rub on my left shoulder (the one I fucked up in November). It's kind of a nervous tic now

I'm a pretty nervous dude despite how I carry on around those I'm used to.
Jam it back in, in the dark.