Just to repeat the last point = Maybe you could do a course like this with a friend who is overweight? Maybe you could catch up with some old friends you have not seen in years? Maybe you could meet in person with some of those you know on facebook? Maybe you could join a group of people who share your interests? Whatever it is, remember humans evolved as tribal creatures, being around others is fundamental to our health and happiness regardless of whether you are overweight or losing weight.
ACTUALLY DO THIS!