I'll never understand why so many of you guys insist on being heart-achingly lonely. All of you, gather 'round, it's pep talk time.
Look. There are 6+billion people in this world. People relatively close to you are fewer than that, sure, but you have an advantage with those people: language. You can talk to them. You can ask them questions. You can find out stuff about them. If you find out that you like them, you can tell them. If you do tell them, the very worst that can happen is that they say "no, thanks" and you move on to the next person. Seriously, that's the very worst. You don't have to be crushed, or bitter, or whatever, so long at you make a legitimate attempt.
The biggest obstacle to loneliness is realizing that people can't fucking read your mind. If someone shows interest in you, and you're interested in them, all you have to do is get some way for them to figure it out. Tell them. Not ballsy enough? Write a letter/email/whathaveyou. Not your style? Serenade them. Try to start a rumor chain. Do interpretive dance. Fucking do something to let them know. You don't even have to gusto up to do it. Usually social clues will let a person know, even if you don't know you're giving them off.
The easiest way to do this, though, is usually just walking up to someone and asking, "Hey, you wanna go get something to eat sometime?" Seriously. Try it.