My true self seems to only exist on the internet. I want to be me in meat space, too, but I just lock up most of the time and become completely non-verbal all the while I am aware of it and screaming inside my head to just do this, or say that the way I would on a comment or a chat room.
That or Autism (which lends to Selective Mutism). The actual neurodivergency, not the internet's/4chan's idea of it. It's not always as visible and obvious as people think. People can go through their whole lives not knowing due to it impacting them as a series of miscellaneous, tangentially related difficulties and never actually finding out about how it affects your life.