What can I do about my resting bitch face?

My friends and family say I have a face that look like I want to murder somebody. It’s really mean looking and I feel like it a reason why I have a hard time with getting to know people. I think I seem to scare people away and often leave a bad impression. Smiling is hard even though it kind of help, but I’m just really awkward. I’m not mean I’m pretty friendly it just don’t show.