How is the Crit Useful?

We discussed the chapter we read in 7 Days in the Art World that talked about the Critique(The Crit).
What I really thought about after class was that there are so many factors that can affect the artist and their work. Be it positive or negative feedback, the work could be directly affected. It scared me because I started to think how I would react to a critique that may be negative. It is hard because our work can be personal, or we become attached. However, over time I have allowed myself to take in criticism in a way that I can still make work and not fear the type of art I will be making.