Minecraft – I dug a really deep hole in creative mode in minecraft but i didnt die and now im stuck in this weird area, what should i do

Actually, the problem is that the cave has a "ceiling".

[Animals] will always spawn on the highest available block in a column i.e. the one that can see the sky.
_{– Animal Spawning at Minecraft Wiki}

It sounds as though you're in the Void. That usually kills you, however, which makes me suspect you're using mods. If you happen to be using Single Player Commands, you can use the /home command to warp back to your bed or spawn point.

If not, you're likely stuck with using an external tool. In particular, I know that MCEdit has the ability to set the player's current location.