I teach individual flute lessons on Saturday mornings, and each week I like to ask my students how they thought their practicing went. I have one student--an extremely gifted 7th grader--who almost always says she thinks her practice quality could have been better. When I ask her to elaborate, she says she didn't get in enough time or she didn't make enough progress. Her responses got me thinking about how hard it can be to be pleased with yourself as a musician.
The competition in the music world is so tough that it's tempting to try to get out ahead of any critics by bringing up your own faults yourself. After all, it's pretty hurtful when you're excited about something you've accomplished and someone tells you that it's not good enough.
Honestly, though, it's exhausting to be around this sort of negativity, and it makes you unbearable, not untouchable. Go play a gig at a wedding, nursing home, or elementary school, and you'll be reminded of how skilled you are and how much people admire your ability to pull sound and beauty from the air. People who don't get to experience live music all the time are blown away by a heartfelt performance, regardless of a missed note or two.
So enjoy what you play. Of course, don't rest on your laurels; continue to strive every day to take your musicianship to the next level. But don't call everything you play crap either.