Stronghold not existing

I have tried it is several world but I get eyes of ender in creative I don't know about survival no cheats but I've uses just creative, survival with cheats both the same  I get eyes of ender and I follow them all the way to the location and I dig down and I do t hit anything so I keep going I try another eye and I've gone to far, I use the eye till it's the exact location underground and nothing. So I dig around the around and there's nothing I at least dug 9 blocks in every direction and found nothing so I have no stronghold, no portal and no ender dragon please someone help, I look at the other reports and none were my specific problem T-T