Hey friend, American here. We all feel like that inside, at least a little. I was a huge introvert, and still am to an extent. However, I’ve been forced into pretending to be an extrovert for ages. I need a bunch of time to myself after things like business travel though, where I have to be the other me for long periods.
The only advice I have is: try it out. It sucks at first, but it gets easier. Sometimes you might actually enjoy it.
If you ever need help or want to practice in a judgement-free space, hit me up. My German isn’t so great but I’ve spent some time there.
Pliny sends his regards