This is me also, although I had honestly never heard of RBF until I just googled it. Also I'm an introvert, so people think I'm mad and stuck up. I got so self conscious when I was younger, I can't tell you how many times, starting in high school, I heard "smile!" Well, nobody goes around smiling all the time, I can't help the way my face looks at rest.I have serious RBF so they think I am antisocial and generally pissed off. They would be correct.