OK, so we've already done "Worth." Isn't value the same thing?
Oh well, I'm game.
The value of something is determined by what someone will pay to have it. How much money, time, and/or effort one will exert for an item or towards a person gives it value.
It has often been said that one shouldn't let others determine their value.
Isn't that how value works?
If one is worthless to others, no matter how much positive self talk is spoken, he/she is still worthless.