Alone Vs. Lonely

You've all heard this before, "like being alone in a room full of people." I sometimes feel this way, I'm sure many people do. And how I envy the ones who can happily say they never feel this way. I wonder how many people can actually say that... Everyone feels lonely or alone sometimes. I believe there is a difference between the two. Loneliness seems to be easily cured by someone simply stepping in and lending an ear or a shoulder or even some type of sympathy for whatever the situation might be. Being alone is quite different, there are people there, sometimes people pretending to be your friend, but no one really listens. They might say they are, but it's never fun being alone with someone who inhales how you feel and then blows it right back out. These are the selfish people who care about themselves. They are the friends who do this...
Example:
Victim: I've just been so out of it lately... My family life is really taking a turn for the worse and--
"Friend": Don't worry dude, I totally get it. I totally get you. I understand. Like, the same damn thing is always happening to me. I'm always getting prodded by my parents to be the perfect--
HOLD IT. There is definately something wrong with this conversation. Who brought the conversation up? Who came to the supposed friend for help? Yes, that would be the victim. I HATE people who tell me they're going to be there for me when I need them or someone to talk to and turn the tables towards themselves. Then, of course, I listen to them and give them my best advice, the type of advice easy to give and hard to follow, and I'm back in the same situation, square one. I'm never going to understand how one can be so into themselves that they don't want to make someone feel better when they really need it. You know?