Maybe you were descended from Johnny Appleseed. Who knows. But one thing I have learned is that sometimes by collecting the seeds, we are not helping the plants. Some seeds need to be left to the elements in order to germinate; by locking them safely away in our little bags and boxes (I'm guilty of this also), the seeds may never have a chance to live. If you love them, set them free!
That being said I am in the process of trading hundreds of seeds with other similarly obsessed people over on Cubits.org - Ella's Garden - Hog Wild Piggy Seed Swap. It's not too late...step away from that tray of seeds!
