You're too arrogant. If you want to learn another language, you need to be humble. Fix that and go out and speak with your fellow Germans: poorly at first, but with time you will do better.
I think this is exceptionally good advice, but phrased in a way that I can't imagine it being accessible to the target audience. People who feel they are smart are often stymied when they run into their own humanity. It's a journey of discovery. Embracing failure is hard, humbling and for some people literally humiliating. That the humiliation is healthy is something that takes time to understand ;-)
Yeah, and especially when learning a language....because you are going to make mistakes, and people will laugh at you. You may have the experience of talking to a 4-year-old, and realizing the child can speak better than you can.
But you humble yourself, keep going, and then you learn the language.