It can mean two things:

1) To literally be in the presence of no other person.
2) To be surrounded by people, but said people are largely inconsequential, in that you take no interest in them and vice versa, and so the situation is as good as being alone.

It can lead to intense feelings of hopelessness, and depression. One may feel that they will forever be alone. It's a feeling commonly associated with the inability to make friends or meet a girlfriend or boyfriend.
"Damnit. Since I moved into University, I feel so alone."
by shaneo632 September 26, 2006
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What I am on the inside. Even in a large crowd, I am alone on the inside.
by Zach G. November 24, 2003
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1.) An emotional feeling you get when you feel that there is no one there to support you or, sometimes, love you.

2.) A physical feeling you get when there is no other prescence of a human being in the same room.
1.) Ever since my friend moved away, I feel so alone.

2.) When my dog left the room, I was beginning to feel alone.
by Arley June 14, 2004
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The status you gain in response to extreme harassment and backstabbing. This may most likely include, but is not limited to. People who were once your friends calling you every name in the book for no applicable reason. ie "Failure" "Ugly" "Retard" Call your 100% real leather jacket fake. Treat you like dirt and say they were just kidding. You tell them to stop and they get upset. Then, when you finally decide to do something about it you end up the bad - guy and your pretty much removed from the group because nobody wants you there anymore.
Those Sons of bitches i wasted my life befriending stabbed me in the back so now I'm an Aloner.
by The True Anti-Hero November 2, 2009
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a disorder marked by habitual masturbation where the only fluid leaving your body is tears
Since that bitch left me I've been so alone.
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