I've said this to a few members on here:
You need to sit down with your partner, face to face, and discuss the relationship (where it is, where it's going).
Be calm, collected and don't get upset and shout or scream.
A break up may happen so be very prepared.
The worst thing would be to stay doing something that's obviously hurting you both.
Another bad thing is to hide your feelings so they eat away at you both.
Get these things out in the open calmly and as understanding adults, then you can both, as a couple, decide what to do with the relationship.
Remember, you may not hear what you want so be very prepared and be strong and mature while talking.
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When it comes to the feelings of worthlessness, believe me you're not worthless.
Depression is a thorny bug the hurts anyone and everyone it wants, you're not unwanted or pathetic, it's the depression attacking you and making you feel that way.
Have you seen your doctor about these feelings? I'd recommend a trip to see him. He knows all the various avenues to recovery, and should help you find them.
As for the lonliness, it's nothing you've done that's made people go quiet, maybe your family just don't know what to say or do. I know my dad is like that, I mention depression to him and he goes quiet and clams up!
Contact them again and ask about meeting up again. Don't mention your feelings over the phone, wait until they're with you at yours! Lol!
Stay in touch and let us know how you get on with stuff. Good luck, SSF.