You say you "are not the sharpest knife in the drawer", yet I can tell by your post....your thoughts are well organized, your grammar and composition are decent, you do a good job of expressing yourself...that you are probably sharper than you give yourself credit for.

I really don't know how a person can determine their self worth, as an objective appraisal would be very difficult. However, I do know that wallowing in self-pity is destructive and will erode any sense of self worth you may have had.

You need a positive plan for your life. If it involves retraining or additional schooling, so be it. Don't allow yourself to be intimidated, or procrastinate. You are well able to handle it ....just keep a positive attitude.

Good luck and God bless you.