Sean O’Connor never saw himself as an entrepreneur.  He was a former footballer, a sports scientist, and above all, a fan of the game. But in his own mind, at least, he was never an entrepreneur.   “I still get imposter syndrome. I’m not sure if I’m a businessman or not,” O’Connor says. O’Connor might have his doubts, but his body of work tells a different story. After all, we met just minutes before he made his way to the main stage at The Real Deal in Goffs to tell an audience of 1,000 people how he pulled off one of…