Don't know if it is common for germans to know three or more languages, or if this is a humble-brag...
Edit: I think actually 28% of Germans claim to know their native language and at least two other languages well enough to have a conversation (for some German is one of the other languages). In any case knowing 3 languages is pretty common in Germany.
French is pretty strong too, but its seen as slightly more exotic whereas English is seen as a necessity/requirement for being "cool".
>if this is a humble-brag...
Nah - unique circumstances. German background historically, but grew up in South Africa - where English and to a lesser extent Afrikaans is pretty much compulsory. Especially being white - people address me in either English or Afrikaans and expect that I reply in kind.
The school I went to alternated between English and German as the teaching medium - funded mainly by German though.
Edit: You should see some of the locals. They speak like 6+ languages. Sure they are closely related languages mostly but still...damn. Also...we've got more official languages than any other country.
Most Norwegians go to our equivalent of high school (age 16 to 19). Those who wants to be accepted by a university choose a path that targets higher learning, where a 3rd language is one of the mandatory subjects. Many in my class had chosen optional classes for that language when they were 14, so that they could learn something else in their final year.
I can only speak for Norway, but I think this is common in other Scandinavian countries and probably many other European countries as well.
I was among those who chose an German as an optional class when I was 14 so that I wouldn't have to take it in my third year of high school. Now I can say where I'm from and that I'm hungry, but hardly much more than that.