I feel you, things were really starting to wind down when I was in my early 20's. But I second the local library comment, based on your interests. Places like NH Sports Plex have leagues you can look in to, I've made some of my best friends at gyms since it's a shared interest thing, and often those people have connections to other interest groups. Oh and if you're looking for outdoor connections there are local hiking groups, just depends on where you're located. They generally have a Facebook presence if you search for them, same goes for your local town/city as well.