I'll bet that 99% of the time you practice drawing your weapon from a standing position. When I observe all the "real gun fights" on YouTube, I see that real street encounters go to the ground all too often. So it makes sense to practice drawing your gun from the disadvantaged ground position.
Watch this video. Learn how to draw your firearm quickly and efficiently from CCW Breakaways enlargeable holster-pocket openings. Then, buy a Blue Gun . . . and practice, practice, practice!
Always be prepared. Always carry comfortably.