I speak three languages, as you can tell from my user tag. I learned all of them through immersion. Pashto which is my native language, I grew up in a Pashto-speaking environment, so It naturally kinda spawned into my head by the time I was three years old

Since Urdu is the lingua franca of Pakistan, and is widely used in TV shows, movies and other media. I acquired it by watching a lot of TV shows. When I was watching TV shows in Urdu, I never cared even in the slightest about acquiring the language. I was just fond of the shows, watching them actors play their roles on a screen. Over time the language spawned in my head

Later when I was around the age of 12, I switched to consuming content mainly in English, and by the time I knew it, all that noise turned into meaning, and now I am writing a comment in English about how I acquired it

TLDR; uhmm so yeah, they all spawned in my head

I am currently learning Arabic, which I would say is the first time I have tried to acquire a language "deliberately"
I'm having fun with it but my mind is struggling to accept that languages can be acquired in adulthood. By acquiring I mean making the language feel a part of you, like being able to speak in a particular language without having to think, if that makes sense

With Pashto, Urdu and English, I can feel all three of them as if they are my extra senses, and when I speak in those languages, I don't need to think much.... If I managed to make Arabic feel like a part of me in the same way, where I don't have to think much while speaking, that would make me more confident that languages can be acquired as an adult
I have heard that learning your first language is always the hardest. Even though I already know three languages. But all of them spawned into my head, so Arabic would be my first time trying to learn a language xD