German is more familiar now since I live part of the year in Rome and part in the German part of Switzerland. But it's not difficult to sing in German; it's difficult to feel in German. This takes time. It's a culture.
When I had my first voice lesson I was 15 years old. And I had a really good teacher. This is what made all the difference. A good teacher will teach you the technique, but also how to listen to your voice.