Dutch is my mother tongue. Started teaching myself English while still in elementary school several years before they started teaching it, which is only in the final 2 years. Picked it up from playing videogames, watching movies, listening to music. Naturally, for a lot of the words I initially did not know how to write them as I'd only heard them.
Fluent in Dutch and English... I'm okay with German, I'll often understand what's being said when I hear it or see German text. I'm definitely not fluent though.
Average maybe?