Your accent is your way of pronouncing words. What I think you're saying is that there is only one American (for example) accent, but there are other determinants of how they actually speak. But those determinants simply change their accent to a specific American accent. We each have an individual accent when it comes down to finely-tuned phonetics.
I don't understand this part: "I mean when you read "all" or "cool" or "laughing" or "enough", there's only one way to pronounce them. To me, there's more than one way to pronounce them." Your second sentence is right. What's your source for the opinion in the first sentence?
Interested in Language