I won't suggest "traveling", but I suggest moving to and living somewhere very different from where you grew up/went to school. Especially if you're a US citizen, because you have a lot of global geographic flexibility.<p>Living in a new country by yourself will make you pick up a lot of skills like those suggested here: cooking, staying fit, managing your sleep, etc and also what you suggest you would like to learn: be social.<p>Use online tools to find people to meet, or just walk out into the city and strike up conversation with strangers. You'd be surprised, in most parts of the world, people are happy to talk to a stranger who genuinely wants to learn from them. It takes a bit of getting used to, but you'll eventually get there. You may pick up some essentials of the local language, learn about how people can lead different lifestyles than what you're used to, and in general become a better person to deal with a shrinking world. You will also have fewer social obligations to friends and family while away, giving you a lot of freedom with your time, something which I personally valued a lot during my time alone in new cities.