You were born, I was born, I bet you know a whole bunch of people that were born. You know what that means: BIRTHDAYS!
I love birthdays because they are about the sheer awesomeness of the birthday-person. It's not about what they've done or accomplished, but who they are.
You might be depressed, you might feel like a failure for a variety of reasons (cough capitalism cough), but gosh-darn it you were born, you're a human, and you're here. PLUS people love you?! Killing it.
Let your pal know just how freaking happy you are that they were born and are in your life.