However, it’s not so much about being shy as it’s about it simply not being a custom.
So, why should you devote your time and energy to romantic German phrases – especially when Germans have earned a less than romantic reputation worldwide?
This may also be why they like getting drunk and partying…In America it’s more common to approach people randomly and also to talk about random things.
They are not conditioned to flirt with women randomly and tend to be quite rigid.
In America it’s common to walk up to someone and start talking randomly, in Germany less so.
It’s not that the Germans don’t talk, but they tend to stick to themselves unless they are at a party or some other social gathering where the purpose is to meet new and old friends.