Tips for how to have “good energy” or a good aura?

I almost never get talked to first in social situations and I'm guessing that it's probably because I don't look very inviting. I have pretty bad RBF and everyone in my life has told me that I perpetually look mad and at best intense. I try to consciously change my facial expressions but my RBF still comes out most of the time. Does anyone have any other tips for how to have a better aura? I'm sure there are other things I'm doing wrong besides my RBF.