Looking in the rear view mirror: Advice I would give to my 21-year-old self

You’ve heard people say, ‘If I knew then what I know now, I would’ve avoided a lot of mistakes.’ Looking in the rear view mirror, we’d all be more successful, but the notion of starting my career with a crystal ball fascinates me. 
As a quick background, I am an ad brat; my father started our agency in 1964. He wouldn’t allow me to join the family business right out of college, so I worked in NYC, mostly at Ogilvy & Mather, writing copy for global bra