Loneliness is. It doesn't matter who you talk to or if you have good friends or not, if you feel lonely, you're lonely!

Some of it is perception, some of it "self" and what you are working at/want. Everyone gets lonely, it's a "human" condition. I know that doesn't help at the moment but moods and feelings and circumstances change constantly. Find some "social" situation; school, work, clubs/organizations, something you can "join" and meet people at. Volunteer. Something somewhere is there for you and someone will "jump out" and work to help you. Seek and you shall find :-) It actually works that way?