"Don't edit your soul according to fashion."
I recently taught one of my friends a secret trick I learned a long time ago from a magazine. When you feel like a giant failure (my friend is particularly vulnerable to people who make her feel this way), imagine yourself when you were 10 years old. Envision 10-year-old you meeting now-you. What does she think of you? Would she want to grow up to be like you?
That's how you measure success.