Humm... I read Kev's post and some lines from the replies here, and I thought I'd write a bit here, even if it will not be a "reply" but maybe just a share of my ideas/feelings...
I think there are lots of people who feel alone. Some are in fact alone, some have lots of friends, but still they all feel like they're the only ones out there and everyone else belongs to a different world that makes our lifes' background.
I must say I completely sympathise with you (sorry for any spelling erros ), and I know you're not looking for sympathy. I'm going through a phase (I like to believe it's only a phase) where I'm kind of alone and feel like that, all sad a miserable...
It all started when my first boyfriend broke up with me about 5 months ago. I didn't go into therapy and was not diagnosed for any kind of depression, but I strongly believe I was close to. If someone said something less nice to me I'd cry immediatly, I couldn't concentrate, I could just think about "why me? we were perfect together...etc etc"... It even led(lead?) to self mutilation, such as cutting, but that I was able to stop and now I'm ok about that.
Well, a couple months later I had a new boyfriend. He had been a great friend for a long time, and was basically my only support after I broke up, so we became very attached to each other, and he had always cared a lot for me...
Now I have a steady long distance relationship with that boy. He means the world to me, and we only meet once each month for a day or weekend, which is very hard for both of us, but maybe "more" for me, because here I don't have any friends, so I'm literally alone.
I'm very shy (and I mean, very), and I tend to hide myself from people, but it's not on purpous, it's like the way I am. My boyfriend loves me being like this, he says I live in a little shell and I created my own kind of lifestyle inside it.
What I wanted to say, is that there are people here who feel alone. And sad. I know sometimes I come here, and although I don't start any topics, whenever I find one to reply where I can tell about my life and stories I write a lot, like I was talking with someone. This makes me feel better, I guess.
So, I have a partner, no friends, and I feel alone. Just like you, without a partner, but you do have friends who care for you.
I think and you can support me on this one, this is something some people our age go through, we're in the middle of life and just "growing up to the world", being aware of all the troubles and difficulties there are out there and it kind of gets to us, and we just have to learn to deal with it.
Come here anytime to talk if you don't have anyone else. I'll sure be here ready to reply
*got to go have dinner eheheh*