There are a few reasons why your voice may sound raspier and deeper in recordings compared to how it sounds to you when you speak. Here are some factors to consider:
Microphone characteristics: Different microphones have different frequency responses and pickup patterns. Some microphones may emphasize certain frequencies, including lower frequencies, which can make your voice sound deeper when recorded.
Proximity effect: When you speak close to a directional microphone (such as a cardioid microphone), the proximity effect can come into play. This effect causes an increase in bass frequencies, resulting in a deeper and fuller sound. If you're speaking closer to the microphone during recording than you typically do during normal conversations, it can contribute to the difference in perceived voice quality.
Room acoustics: The environment in which you record can also impact how your voice is captured. Rooms with poor acoustics, such as those with hard surfaces that reflect sound, can introduce additional resonance and reverberation. These acoustic characteristics can affect the tonal quality of your voice, making it sound different from what you're accustomed to.
Perception and familiarity: When you listen to your own voice during everyday conversations, you hear it through bone conduction and air conduction. This dual pathway gives your voice a certain resonance and perceived pitch. However, when you hear a recording of your voice played back, you only hear the air-conducted sound, which can sound different to you because you are not accustomed to hearing your voice in that way.
It's important to note that these factors can contribute to the perceived difference in your voice, but the extent of the change can vary depending on the recording equipment, techniques, and settings used.