Perhaps it is, but I believe it's important to fight off any feelings of pride or narcissism.
The only variable I can change is myself, and thus I recognise that every single mistake or failure is mine and mine only. I believe that's the healthiest outlook on life that one can have.
Also, I think too I don't have any right to say what I'm worth - my worth is determined by how much my labor creates value for others. If I'm paid peanuts, that speaks badly of me.
The point is that, by default, you're not paid the value you create for others. It's not pride or narcissism to recognize that in a capitalist system everyone is out for themselves. If YOU aren't out for yourself, no one is.
If your work isn't be recognized does not mean it's not good or useful. It just means it's not recognized.