Well what most made me worry and make me feel bad were that it phrased it: "To avoid such situations, some patients with NPD socially withdraw and feign false modesty and humility to mask their underlying grandiosity."
Because I am truely very conceited, but i would like to believe that i decline to brag, and try to be humble as a kindness to others. Because i hate it when people brag and are arrogant, and i know plenty of other people do too. And if it turned out that i was just lying to myself, which can be something i'm not aware of, then that would really suck. I'd have to change my approach to life for it to remain consistent(which matters to me a lot). And that would be a lot of work, and it might turn out that my easiest function in life isn't a fun one.
I explained it to everyone not because i'd like to have another label, but because if i have ever offended anyone for me being an attention whore, or because I came off as very arrogant, and annoying, that i want to admit it, and apologize.