Yes Madonna was clearly feeling insecure - given this was a period where she was one of the most criticised celebrities on the planet for daring to break down gender boundaries regarding sexuality. M herself has admitted that before becoming a mother she was selfish and narcassitic. But if she hadn't been so competitive and driven to be better than her peers, then she wouldn't still be the Queen of Pop decades later. I'm sure Madonna now finds the emergence of this letter amusing more than anything - she isn't bothered. And remember, Whitney was a Madonna fan - as the video of her getting her life watching the Queen's Super Bowl show in a bar not long before she died proved. They're both icons, and that will never change.