Unless you have physical hearing damage due to some trauma or overexposure to noise, you very likely don’t have bad ears. In fact, assuming good ear health, I don’t think audiophiles have meaningfully better physical hearing acquity than the general population - in other words our ears don’t work any better than average. Listening to music is more about memory and pattern recognition. We audiophiles tend to care more about and pick out patterns and slight changes in the patterns of sound(s) we’re hearing in the music. To say one DAC sounds different than another is really to say that our ears are perceiving a difference in the sound pattern(s) through one DAC as compared to another (or through one amp vs another, etc). It also takes time for the brain to memorize patterns (of any kind, not just sound) to the point where it will detect slight changes to those patterns. To do so new physical connections have to be created in the brain - new synaptic pathways have to form - and that takes time. If you’re new to the hobby and can’t tell the differences yet, don’t fret, your brain is working on it. Give it time.