Everyone has an accent. As others have already said, just because you can't hear it doesn't mean it's there. Accent is defined as a distinctive way of pronouncing a language, especially one associated with a particular country, area, or social class. Since we are all from a country, area, and social class, we all have an accent. There are many small differences between places, even if you don't hear them necessarily. Words will be different, slang terms, intonation, cultural speech patterns. It's all fascinating! Check out www.dialectsarchive.com.