"Don't worry about what they think or say. Just be yourself!"

When you read the above, what does it make you think about?
If someone said it to you, how would you feel?

But how much of our 'self', is actually ours?
How many hours of the day are you the 'self' which pleases your boss, colleagues or classmates?
What about our friends?
Do you always feel you can say what you really think to your parents?
How often can you just sit back and 'be yourself'?