There are associations that our mind makes, particularly where our self importance is concerned. We build a self image structure of beliefs. In that structure of beliefs we usually think of people in powerful positions, as being more important. The associated belief is that if we have less power, then we are less important. And to our belief system less importance means less worth.
The emotional math we do with our self image is to associate our self worth to our power. The more power we wield, the more important and valued we are. The less power we have, the the less we feel we are worth.
This is all to say that we use the subject of power to create beliefs about our self worth. While that may seem to make sense to some people,,,, what gets really weird is when you become aware of the kinds of power we usually use to base our self worth on.