Paul F is right. I did 6 years after retirement (65 here) working three days a week. Job was interesting (maintenance repairs) but after that time I had the same feelings. I just got sick of trying to please everybody all the time. So finally left and don't know how I found time to do everything when working. It is a nice feeling, sort of like a looong holiday. I still feel weird when being with working people (feeling guilty) Hah Hah.