Meeting new people is really going to help. You seem hesitant to do so, and I can understand the inertia. At some point you need to take a leap of faith there and find some way to make some new friends. That could be through taking a class, volunteering, getting a new job, moving to a new house or apartment, joining meetup, or thinking about dating. There are a range of options, and many of them don't cost anything but your time and your willingness to put yourself out there a little.
When you start to get traction, you'll feel MUCH better, and that will rub off on your kids, and I'm sure they could use that from you right now. If you can't bring yourself to do it for YOU, then do it for them.
Accuray
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015