I experience the same thing except my voice gets deeper when I record my voice. It is in fact your real voice but what makes a recording of our voice sound so different... and awful? It’s because when you speak you hear your own voice in two different ways.
The first is through vibrating sound waves hitting your ear drum, the way other people hear your voice. The second way is through vibrations inside your skull set off by your vocal chords. Those vibrations travel up through your bony skull and again set the ear drum vibrating. However as they travel through the bone they spread out and lower in pitch, giving you a false sense of bass. Then when you hear a recording of your voice, it sounds distinctly higher.
