Marcy-
I'm sorry you are feeling like this or just dealing with these feelings but at least you know they are not just "right".
No one knows when we are going to be called "home" but we all know that we need to be here to help/support others. Even after we return home, we are still influencing others.
when I feel this way, I keep thinking this (along with relying on my faith and talking to God). I take a good walk on a sunny day;; sit in a park. I also talk to my friends or try to do something that takes the focus away from myself (doing for others gives me purpose). Perhaps you may need to do a service project- with the rash of tornadoes, floods, there are other people who need to know they are thought about. there are also organizations out there that provide quilts to kids w/ illnesses; quilts to our servicemen/women; how about quilts to the homeless to keep them warm and dry on the yucky nites? Or perhaps to teach your hobby to someone else?
You are only as old as you think you are- don't let "evil" get you down and let you think that you passed your youth. You are worth something here on earth- regardless of your age (I know you know this) perhaps taking a break or find another reason to quilt will help shake it.
your best bet may just be reading the message board- there are alot of warm and supportive people here.