I've always been really shy and anxious around others. But when people get to know me, they become surprised by that because they assume the exact opposite with how outgoing I always am.
I've never been comfortable around people. There have been many, many, MANY times where after I was all done mingling on some social setting, I had to stop and gather myself with how anxious I would get.

And now the classic question: if I'm so shy and with such bad social anxiety, why am I always outgoing? I can already see those reading turning their heads at this, but I try to be social as a means of coping with it.
People terrify me, it's true. But when I remain quiet and keep to myself like you'd expect from someone who is shy, it's just so much worse for me. I feel terribly out of place being the quiet one in any social setting, I can't stand it!

It makes me even more anxious and it depresses me as well. I regret every time. So I do the opposite! I put myself out there and become a people person. It's kind of a no-win situation for me since it still gives me anxiety, but the alternative of staying silent is so much worse.
I don't know if there's really such a thing as a "shy extrovert". That's an oxymoron if you've ever seen one, right?

But if there isn't then allow me to coin the term because it defines me to a tee!