Our Big Brothers Big Sisters have a lunch buddy program, where volunteers go and eat lunch with a student. I would also check with groups like the scouts or the senior recreation center in your area. There are also many groups that you could join. My mom really enjoys Red Hatters and has many friends that she has gained through her membership. She also took computer classes (at a vastly reduced rate) at a local university and she made lots of friends there too! She even met a group of ladies that she often sees while shopping at Goodwill and they have formed a lunch group.
I hope you find a group or a family soon! I don't like to think of anybody being lonely !