1) I am certified C1 German - studied in high school for 6 years. Granted, I don't like speaking German and will use English when possible, but it's not a matter of not being able to connect with them.
2) Shortly after moving in, I started dating a German woman. Lasted close to a whole year. That was more than enough time to meet a lot of her friends, I got to meet her family, etc. That was more than enough time and opportunities to get a good insight into "native German" lifestyle, culture and values.
You don’t have insight into German lifestyle, you have insight into that one woman’s family’s lifestyle (and only less than a year, you’re not a family member at that point).
I'm not claiming that I know all of Germany or all Germans, I am just refuting GP's guesses.
Also, she wasn't the only German that I've met and it wasn't the case that I only met native Germans through her personal network. I also worked at Deutsche Telekom and Mercedes Benz. I've had the opportunity to interact with lots of people outside of the work environment.
2) Shortly after moving in, I started dating a German woman. Lasted close to a whole year. That was more than enough time to meet a lot of her friends, I got to meet her family, etc. That was more than enough time and opportunities to get a good insight into "native German" lifestyle, culture and values.
Want to try again?