Yes, this! Exactly this!

I have many years of practice maintaining what I call an "even keel", or an emotional equilibrium. I can only really remember about four or five total meltdowns in my life. This also followed by the adrenaline come-down, and then total shame at my loss of control, even though I obviosuly couldn't control it! ( I remember a spectacular one, where I hit another kid, knocking him off his bike.) One of the primary reasons I don't look as if I care much what other people think of me is that I'm spending the majority of my time in my head "maintaining". I don't have the bandwidth to also care about what other people are thinking about me.