Labeling theory is the theory of how the self-identity and behavior of individuals may be determined or influenced by the terms used to describe or classify them. It is associated with the concepts of self-fulfilling prophecy and stereotyping.
Labeling theory, the proposition that humans are influenced and mold themselves to what we classify them.
On the other hand, you have people who choose to adopt labels or beliefs in order to validate their existence or as a form of ego protection.
I think a good question is, how capable of change are we? If we do not change is it because we are unable to, or because we do not really wish to?