I face this almost every time I meet someone new. I've forgotten the number of times people have asked me why I look sad or angry. People are intimidated often

I face this almost every time I meet someone new. I've forgotten the number of times people have asked me why I look sad or angry. People are intimidated often (especially women, which they've verbally expressed), until they get to know me. Combine that with an introverted personality, heavy beard and an above average height and I look like the right hand henchman of the evil Russian Drug lord. Even if I get a little serious in discussions, people think they've angered me. I constantly have to throw in jokes, just to balance the state of seriousness. I consciously try to smile more often, but it feels forceful. Wondering if there are any facial exercises that help.