My mother is a widow and empty nester and she is exactly like this, and only goes out when we invite her.
I read an article about things she could do, some of the suggestions was to make a great meal, b/c even being home alone you still deserve something wonderful to eat, and it can be rewarding to learn a new recipe.
You can join a walking club, take a cake decorating class, learn how to digital scrapbook, learn how to make balloon animals (tons of videos online). You said you arent into rafts, but there may be something out there you would enjoy doing, learn to make soap or jewelry or paint ceramics.
On Saturdays, go to the park, feed the ducks, and bring a book. Perhaps a book with short stories instead of a long novel would be good for you.
go to meetup.com and look for clubs in your area. there are tons of different ones out there that you could join.
You could also do community service. Join Big Brothers/Big Sisters and take out a child in need on Saturdays, volunteer at an animal shelter on the weekends, or habitat for humanity or doing story time in a library. You would be amazed at how doing something like this can feel so rewarding, and rally jump start your self esteem, energy and drive.
There are tons of things in your area, I know, I used to live there!