Hi Precious Things,
I don't think anyone should have to go through life alone, and I think your t is right about having support outside of therapy.
I would encourage the support group, as scary as I'm sure it is! Everything there is confidential I would hope, so the person running it shouldn't care that she's your neighbor, and her kids would never know. Maybe if you take that risk, and I know it's big, and go to the group with people dealing with your same struggle, you can slowly find other supports. Like maybe you and another person in the group will become friends over time.
And I don't think you're a loser! I know how painful it is not to have friends, as I've isolated a lot in my life as well.
And, if you feel comfortable on PC and like you have connections here, this is a part of your support system too.