Have somebody video you, the video don't exaggerate your shot at all.
If you want to know if the creep is really effecting your shot, go shoot through a chronograph. The chronograph will show you how consistent your release is by looking at the consistency of your arrow speed. Say if you shoot 190, 190, 191 FPS you have a good release. Now if your arrow speed varies from 183-191, you need to work on your release. Of coarse these numbers are made up but I hope you understand what I'm saying.
A form master will also tell you if you're creeping. The form master is a very good tool to periodically check your shot as well.
Like mentioned above a controlled creep is not that bad of a thing to deal with. But like most, we are always in pursuit of the perfect shot.