Once you have taken action, it solidifies or determines who you are. In part, this is who you are seen as: your identity is predominantly socially constructed.
To commit an act that brings you shame (self-hate) provokes extreme psychological responses: either you overcorrect away from yesterday’s heinous self, or you over-justify your position, further alienating some while enraging and converting others.
Both responses create a “new self” from a single point, a turning point where your agenda diverges either to abnegate or rally and resuscitate. Either way, it is a reaction that is obviously “you,” yet “not you” because it is a divergent alternative provoked and created by the inability to forgive your original act.