i know how much loneliness and being down suck and that it can sometimes feel like one is stuck in a neverending tunnel of nothingness and darkness.
however, in my opinion and my experience, a partner or love or a bunch of friends will not cause a "zaaap!" and suddenly make life perfect. from how i've experienced it, life just doesn't work that way: the strength to make life good has to come from within you.
sure, other people can contribute and assist, but you are the base.
i know this sounds like i am putting an awful lot of responsibilty on you, which is just what you don't need, but that's not what i mean. i mean that you need to start reaching out to get help to get out of the loneliness you're currently in.
you wrote that you need someone to "force feed goodness" to you, but really, imagine how someone dragged you out to do something when you're not quite feeling ready for it yet and just aren't in the mood for it. makes you feeling even worse afterwards, doesn't it? so if someone would force you to be positive and around others, i doubt they'd be helping you much at all or help you feel better.
it sounds to me, hon, that you urgently need someone in real life to talk to about your loneliness and sadness. are there any adults you feel you can open up to? a parent or relative, a counselor, a member of your church (rabbi, priest or other spiritual leader), a family friend or your gp could be the right person to talk to and ask for help. a professional such as a psychotherapist or psychiatrist could help you figuring out ways to deal with and get out of your loneliness and sadness.
if you are currently already seeing a psychoterhapist or psychiatrist: have you been open to her/him about how you're really doing? if not, be open with them immediately. these pros can not help you to the best of their ability if you don't let them help you.
besides professional help, there are plenty of things that can make you feel better, less lonely, more useful and happier. i'm personally a great big fan of volunteering for a cause you care about. no matter what you do - help at your local animal shelter, or distribute food or do website or pr work for a local women's initiave, help kids with their homework, - you get out, you meet people, you do something valuable an get lots of distraction, too. most charities are thrilled to get volunteers and value your free work a lot.
other things you ccould try are group sports or classes for new sports (makes your body feel better, great way to meet people) or exploring your spiritual life, for example through groups or events your church or belief group holds.
i know it can seem like the biggest hurdle to just call some place and say "i'd like to help" or to go somewhere you've never been before and be faced with all these new people, especially when you're really down. but i promise, getting over that initial hurdle is definitely worth it.
hope this helps a wee bit.
"Through repetition the magic will be forced to rise."