You are judged for how you speak and write. The level of education (and standard of living) is also recognizable from how you speak.

This is sad but oh so true. It is the same here, different accents which are noticeable in different parts of the country and people are absolutely judged by it.

My children speak 3-4 different languages well (C1) in addition to their mother tongue and, like me, they are interested in other languages, including Chinese, Korean and Japanese.

That is really awesome!!! I sadly only speak English and then a bit of Afrikaans which as you no doubt know has it's similarities to Dutch and German. My son is starting to learn Spanish now and also says he wants to learn German.

Though I have not dont it myself yet, I do think it is really wonderful to expand your knowledge of languages!

I am a child who grew up between two cultures and wasn't accepted anywhere or by anyone. I am certainly not grateful to my parents for that. I have been discriminated against a lot and still am it even shows if I travel through Europe.

That must have been really hard. Not intentional from your parents side no doubt... but still, I get what you mean. It did not make your life any easier.