Definitely not too weird a question!

There are plenty of introverted Americans who hate how extraverted it is here. And the U.S. definitely isn’t “superior” to Germany in that way (or any other particular way.)

Also, there’s a difference between introversion, shyness, social anxiety, an avoidant and/or schizoid and/or schizotypal personality type, an avoidant attachment style, hikikomori/shutins, autism, and plenty of other sorts of socially-averse sorts of temperments. Some are “problems”, some aren’t. Given the way you’re talking about yourself, it sounds like what you’re experiencing is something you’d like to change about yourself. I do think it’s worth introspecting a bit (see what I did there?) and seeing to what extent your desire to change is internalized shame put on you by others and to what extent changing your presentation in the world would lead to a truer expression of your true self. But assuming the latter is the case…

Practice. Even if Germany is a pretty introverted place (and that’s valid – there are definitely differences regionally with regard to how introverted or extraverted the culture is) there are definitely places/events/gatherings/etc that are more expressions of extraversion than others. Immerse yourself in such events. Baby steps are fine. Start with contexts that are just a little bit more extraverted than you are if you like. And move on to more and more extraverted sorts of contexts. Also, I’d try to focus on events centered around things you hold a genuine interest in. (I, for instance, have enjoyed a lot of tabletop roleplaying games. That activity, even though it’s engaged in with others, feels much less overwhelming to me given that everyone’s focused on a common activity rather than just on “each other.”)

One more word about this. Try to avoid “masking.” That is, don’t invent a facade of extraversion to show people. It’s very cliche to say it, but: “be yourself.” I think probably ultimately if you end up “pretending to be extraverted” rather than engaging in socialization in a way you genuinely enjoy, it’s likely to do you more harm than good with regard to your goals.

Good luck!