SEATTLE — A 21-year journey that began when the Storm selected Sue Bird with the No. 1 overall pick in the 2002 WNBA draft has finally led her here, to the eve of her last regular-season game in Seattle. How do you say goodbye after two decades? Admittedly, Bird is struggling with that. “Sometimes I feel delusional,” she said. “In my head I’m like, ‘You do realize you have like one more game left?’ So, it hasn’t really sunk in in some ways.” It’s all coming at her so fast now. For so long she had been the indomitable, ageless wonder who outran Father Time thanks to good genetics, a strict adhe…