I refuse the label "shy." I ain't shy. I merely do not talk because...
-- you're doing fine without me.
-- you aren't listening anyway.
-- you've made it clear you don't want my opinion.
-- it's not polite to interrupt, so I can't get a word in edgewise.
Introvert doesn't mean "shy." It means we re-energize from solitude. (We're doing it now!) Extroverts re-energize from people. We're just not that.
(Also why you'll find many introverts online, but not many extroverts. We're not anti-social. We simply get no benefits from social situations, and it depletes us the longer we're in them, because we have to try so hard. The opposite is true for extroverts. They get depleted without others around, and they have to try to be alone.)