Who determines "value" ?

In doing some models, I asked myself the question: “how do I know when something I create adds value?” And I get stuck here because I want to say it’s ME who decides whether what I create is valuable, but in the business sense I need others to see the value in it. But then it feels like my sense of value is tied up in external validation- and I don’t like having to rely on other people to determine whether what I contribute is “value.”

So the question is: when it comes to business, how do you know when something you create is “valuable”? THANKS!