Hi there ~
If you have held a fruitful life thus far, i.e. till you are 64 years old, and the self issues are of more recent origin, I would delve more into what may be the cause of your concern. It may be that you have some issues with your family that need resolving. Your deep rooted insecurity could be a long term financial worry. Whatever the problem is, there should be a solution. I think that you should try to find out what the cause of your stressors are with the help of a counselor and a psychiatrist
who can analyse and let you know what may help.
I hope this helped and take care of yourself. Have a good day !