I too, am Swedish and English has been and still is, a core course in School.
Started learning it when I was around 7-8 years old (second class, and ended my English classes when I was 18.)
I've NEVER learned the American English, it has always been the UK English that I've been thought.
Aaand... I thought English was a trash language 8D I couldn't understand why I had to learn that language at ALL, it was so boring. (I've always been bad at languages and math and reading and whatnot hah unless I thought I could use this.)
But... I've been using the internet daily since I moved out of home at 18 and I found deviantArt which was an American site.
I'm still learning English, there's so much I don't know about grammar and what not, but I've almost learned the essential stuff from American movies (as Sweden kindly likes to import and subtitle it).
And I realised that I had become better at English a few years later, like MUCH better than I was at school, so I began to read English books and thus, improving my skills as well.
And a funny note: When I visited the London Eye to get some tickets to said attraction, the sales person asked me if I was from Scotland, which I do take to my pride! :D
(It... could mean that my English is pretty messy but HEY 8D)
However as a Swede, we're surrounded by English all the time, even on the food packages it's written in UK English! English is everywhere. I kid you not.