People usually under-sell themselves. You see it also at job-interviews for example. When someone's good at something and gets notified by it they're like : ahhh.. but it's nothing special... , no.. it's nothing special for you but for others it is! Don't sell yourself short.
And people are quick to thinking that they are really over-exaggerating when they acknowledge that they are indeed a good person, or indeed have a amazing skill etc etc. while in fact, for the outside world an acknowledgement like that is really not exaggerating at all.

Good post!