If this is one of the things you struggle with in life you should give a read to one of the best bloggers out there, Tim Feriss, has written a great piece on what you can learn from Dr. Martin Luther King’s approach to criticism. It is an amazing read that he has made available to read in either a 5 minute or 40 minute read. It is one of those reads that can change your life. Go get your head screwed on straight.
Criticism can be a crippling force in a musicians life. How you react to criticism both towards others and internally shapes the way you will be able to grow your music. By closing off critics and not listening to them you will never grow. While if you take every critique of your work to heart you will be crippled with fear and self-doubt.