Based of that the most obvious moves, depending on what you are currently doing.

Universal: Take up a sport or other hobby. The clubs associated with them are a pretty ready made social network compatible with most any lifestyle. To work, this requires you to pick one you enjoy, and with a culture you do to. There is a lot of variety on offer here - Ive been (briefly) in soccer teams that were essentially an excuse to get drunk after the game, and in hiking clubs that were quasi-military in their dedication to proper planning and preparation, and once rather memorably in a cooking club that unofficially doubled as an dating mixer. (12 people. many more pairings than was at all reasonable before it imploded)

If you want to hit reboot on your life in total, sign up for university. You're a swede, so it's free, but before you do, go hang out. Different courses of study have very different cultures. You should be able to find one which is a match. Next step is important. Make sure to join or create a good study group. Also combines pretty well with first option.

Final option, if you simply want structure above all else, the military will do that for you. It's not a lifetime solution unless you make it a lifetime career, but.. giving aim to the aimless is something it has a lot of practice at.