hmm when i grew up i went to normal (living in germany, german-)school in the morning and twice a week to greek school in the afternoons. my mum would speak german, my dad greek (or horrible german) but mostly i spoke german.
so i started normal school english in grade 5 i think and got into online gaming.. which kind of forced me to learn more english, as everyone spoke english. adding to that i had 5 years of french in school, which didn't stick at all. no idea why but i remember NOTHING.
when i met one of my ex boyfriends (who was from the uk) i would travel there a lot and my english got better.
now i'm married (not to the same guy) and i live in canada. the english speaking side. i would have offended every french speaking person i think

my husband is first nation. so some of his family members speak blackfoot... which i want to learn.
i took japanese classes as well but at some point my brain just said STOP. too much. i kept mixing up words and it got really confusing.
the language was actually a huge issue for me when i started writing. for the longest time i couldn't decide on the language i wanted to write in.
in the end english came out as the winner. mostly because i speak and hear and write it every day and i didn't have to 'switch' my brain to different language mode just for writing.
reading all the other posts i was a bit surprised though. when i think about the languages i know, it's always about how they feel.
greek feels completely different from german or english. it feels warm and liquid. german feels cold but precise. english feels open and relaxed.
it's hard to describe but for me every language i know has it's own emotions/tastes/moods/feelings.