What is Lacan's self worth theory?

Lacan's self worth theory is the exact opposite of what Freud believed.  Freud believed that people judge themselves "by looking in mirrors" and by what they see there. In other words, Freud believed in individuality that came from within, an internal essence that made a person who they are. However, Lacan believes that a person judges themselves not by looking within themselves, but rather by looking at others, and then judging themselves based on how those people respond to their presence. They mirror themselves within other people. What you like in another person may actually be what you like in yourself, and vice versa.

For example, if you went to a party and a few people started to stare and laugh at you, perhaps you would assume that something was wrong with your appearance. Plus, if you were to dislike a classmate for being impatient, perhaps it's because you don't like the impatience in yourself.