I know you speak 3 languages, have you ever heard of daniel tammet or his book "born on a blue day" http://www.danieltammet.net/blue-day.php
It's not uncommon for Finnish people to speak two or more languages. My native language, Finnish, is spoken almost nowhere else than in Finland, so any traveling or communication with foreigners would be pretty difficult otherwise. Also, Finland is officially a bilingual country (Finnish + Swedish). I've learned more just for fun - currently I speak four. But it has taken some time and I don't consider this skill superhuman. Languages are interesting!