You’re not alone.
Many people jumped at the Windows 10 icon when it appeared, thinking they would get Windows 10 immediately. In reality, of course, it’s only a reservation for a download that will occur when the product is released.
Realizing this, and for a variety of other reasons, many people are electing to cancel the reservation and wait to get Windows 10 until sometime well after its release.
How to cancel is not obvious, and there’s a bit of trick.