Awww...I can relate - I feel that way sometimes too. But look at what you've accomplished...your weight loss alone is a HUGE accomplishment that you should be proud of - for you and no one else! I'm sure there are tons of good things in your life - focus on doing what you love and you will meet other people through that - like knitting.
When I get down, I pray and think of 10 things I am grateful for right now...sometimes it is lofty things and other days, it is as simple as peanut butter.
And hey...there's always us!