I too tend to have resting ***** face. People tend to think I'm mean even when it's not my intent (usually depression, anxiety, stress). It was majorly impacting me at work because I'm a manager and my employees were constantly telling me I look irritated and wanting to know if they did something wrong. In my case, I just started to joke with people that I have resting ***** face. It helped. I guess that works for people you know, but maybe not with strangers.