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.
I applaud your self-control. My true self cannot be contained HAHAHAHAHA
Self-control? Noโ€ฆ This is mental illness. And it sucks. :(

I have similar experiences with wanting to desperately be part of conversations, but not being able to expel the words.

Have you looked into selective mutism? Or being a highly sensetive person?

Selective mutism - Wikipedia

That or Autism (which lends to Selective Mutism). The actual neurodivergency, not the internetโ€™s/4chanโ€™s idea of it. Itโ€™s not always as visible and obvious as people think.