Self-esteem is intrinsic. When it is shaky, the world can easily trample on you.
One of the greatest gifts a parent can give a child is a strong sense of self-worth, beyond looks, achievements, bank balance, or social circle.
When people enter their lives, they will be intentional about who they allow in, because they understand that their worth is not sourced externally. Anyone who comes into their life is a complement, not the foundation of their identity.