So...I have a resting bitch face. My lips seem to naturally curl downward--like gravity itself weighs them down. Sometimes I feel so unwell and socially anxious that honestly even if I try to lift up my frown, the muscles just won't freakin cooperate with me. I forget how to smile.
People comment my problem often--telling me to smile, asking me what's wrong. Am I more sick of it or ashamed of myself? I honestly don't know.
Of course I sought help, and was surprised to hear from my therapist that I look more disconnected than simply intimidating...yeah, I know. I must be a mega autist or something. But, nonetheless, I know I can improve.
Try to be expressive all the time. Even with your eyebrows alone, or half a smirk, or even putting your head over your hands.
There are many ways to be expressive without actually changing your normal face. (I would suggest to practice expressiveness anyways. Infront of a mirror or something of the sort)