Generally speaking, if someone has troubles with feeling isolated, I would advise that person to go out and speak to people, try and make new contacts, eventually contact people you haven't talked to in a long time.
If you think you have nothing to live for, well it may sound stupid, but find something to live for, or at least occupy your mind at first. Focus on what you're doing, start a hobby, fill that free time so you have less opportunity to brood alone.
Just wait. You'll see something in life that you like. You just gotta look over all the bad and boring stuff. Don't see anything good? There's something, it'd just be really hard to see, just like those darn easter eggs that no-one ever finds.
