You're doing it wrong. You're mixing and mixing until you've got a batch of dough that's as dense as a brick. You're not just mixing the ingredients together, you're overdoing it. You're the breadwinner of overdoing it.
Want to learn more about The Science of Overmixing?
Underbaking the Batter: The Dark Art of Ruining the Crust is a great resource for those looking to balance the scales.
Or, if you're feeling adventurous, try Underbreading the Whole Thing for a truly... experimental experience.
And for those who've gone too far down the overmixing path, Burning the Bread to a Crystalline State is a great way to learn from your mistakes.
But be warned: these are advanced techniques, and you've been warned.