As somebody who's 29, and moved to a new city in a part of the country I've never been too before, I fantasize about going back to College just to make some friends.

The worst part about it is the more time you spend alone, then difficulty of being sociable increases.

Your body posture and facial features has a lot to do with what other's perceive as "friendliness". Try to stand up straight, and use your lips and eyebrows to be energetic.

There was a TED talk about how body language shapes a person's emotions
equally as the other way around.