I rowed crew in high school with two guys who made it to the Olympics and won medals. I quit before college!
In retrospect (after reading "The Dip"), this WAS the right decision, and I quit for the right reason: I'm 5'10" -- my legs are simply too short too compete on a world class level.
When I slogged through the dip:
I've wanted to write a book for a long time, and have even had publishers interested (in the wrong topics and titles for me). I persevered, and eventually co-authored "Blogging for Business" with a friend and then "What No One Ever Tells You About Blogging and Podcasting." MANY people told me to "give up" -- no "real" publisher would accept a biz book proposal from me, a "technical guy." Books are selling well (by my standards, not Seth's!), and business is booming. Next dip ahead? Well, take it to the next level. Maybe not Seth's level yet, but to where I can impact and help more people, and of course help myself and my family more as well.