How does the psychoanalytic criticism apply to PIGGY in chapter 6?

I don't know how "psychoanalytic" this is. Piggy is scared of Jack but desperate to get rescued. He seems to have repressed emotional issues over the absense of parents in his life. He often plays the role as the victim but when it comes to rescue, he cannot restrain his anger and angst. He admonishes Jack despite the danger to himself.