My first language is Russian, and I had to learn Ukrainian for school. Later on, my family moved to France and I learned how to speak French.
While I was back in Ukraine, I started learning English with a tutor who gave me classes that were way more advanced than those I had in school, and after we moved I kept learning on my own by reading, watching movies and series in English etc.
So, after all this, I can say I'm completely fluent in Russian, Ukrainian and French, and while I consider myself fluent in English, I recognize my lack of practice.
I also had Spanish classes in high school, and while I thoroughly enjoyed them, I never had an opportunity to really get into it after graduating. I can still understand some Spanish, but that's it.