Use any failures you experience to motivate your future successes. Feel great about the fact that you tried and failed as opposed to never trying at all. It might sound a little cheesy, but perspective is optional and how you choose yours will influence how happy and satisfied you are with your life.
Allowing others to shine a light on our blind spots, particularly with respect to our faults, teaches us how to become better conversationalists, better listeners, and ultimately, better people in general. What we learn about our blind spots may not always be pleasant, but it can open up a whole new world we never even knew existed.