Harmonious Dissonance

Meh - no worries. Flemish is utterly useless for travel - it's spoken in its non-Dutch variant by about...15-20,000? The only reason I know it is family. In order to do language, you have to be right stuck in it. I did my university education partly in French; I hang out at community centres and listen for language tics and stuff (think like Canada's 'eh').

And no worries! Flemish is my first language - I learned English only after I went to school as a kid.

Edit because I forgot to mention that by no means does monolinguality mean slow learning. I'm sure if you had the same upbringing as I did, you'd be multilingual too. It has its downside, too - I can't count well in English, because I learned my numbers in Flemish...