Basically, she gets super frustrated when she messes up on even the slightest of things. This is because she thinks the only way other people will accept her is if she satisfies them in all ways. But obviously nobody is perfect. Fixing Luke’s lightsaber she fails at, contacting the past Jedi she fails at, and she has a hard time taking out a simple training remote. Rey sees all of these failures as diminishing to her value. But as TLJ points out, failure is actually a good thing since you can learn from it.

Building off this pointer, this is established in the last two films, in TFA she frees BB-8 to please it and later bypasses the compressor after Han initially rejects her to the point where he wants to send her and Finn away to another planet. Not saying this is redundant, I’m just reinforcing it.