Quincey P. Morris said:
Totally get that, but I tell my kids that are in band and orchestra: nobody knows the music like you know the music. Mistakes happen, but you're the only one that notices them.
Yeah... that doesn't help me. I notice mistakes when people play all the time. If someone is pitchy or misses a note, someone who knows will hear it. I'm thinking about the people who will hear it, not the majority of people who don't have the ear for it.
Similar to how I view my ability in music. I come from a truly musical family. My grandfather, aunt, and extended family are amazing musicians, and have played professionally all their lives. So, I tend to compare myself to them. It's the type of family that, if you start playing out of tune, someone will yell from the other room, "tune your B string, it's flat!"