We often make very different kinds of mistakes. Funnily enough, I initially learned English by getting exposed to pop culture (kung-fu movies, N64 games and anime dubs) through a bilingual friend I had through 3-6th grades. Formal English teaching in schools only started in 4th grade when I was a kid. I didn’t know anything about the language by then. My now 6yo son understands way more of it than I did when I started high school, and speaks it quite a bit.