No, fool. I'm an introvert. You're the ones using your extrovert privilege by calling yourself 'introverted' when you're not.
So it's against the rules for an introvert to control their reservations in unfamiliar situations, or step outside their comfort zone? Hmm. Well I don't agree with you, although there must be differing levels of introvertedness, if that's even a word.
I'm an introvert -- perhaps most of us here are -- but
it doesn't stop me I don't let it stop me from striking up conversations with random people in the supermarket or petrol station. I'd be useless in a nightclub though. And my introverted nature is probably why I chose a job where 90% of the time, I'm by myself driving my van. Again, I don't let that hold me back from conversations with the people at goods in/out. In fact I'm probably more confident with these meetings, as I'll likely never see most of them again ,or for several weeks/months at least.
But the phone is different: the number of times I've found excuses not to call for work I'd probably get is frustrating, to say the least. It costs me money ffs. It really does depend on how I'm feeling emotionally / psychologically. Talking on the phone can be a huge hurdle for me.