What kind of experience is it when the sound is particularly quiet?

My voice changed when I was thirteen. I belong to the boy whose voice changed very early in my class. My childish voice suddenly turned into the voice of a drake, which really made me hard to accept and I became less talkative. Later, after the voice change period, the voice became less harsh and became very low. My classmates say I'm an uncle, but I'm only sixteen or seventeen. Later, when I was in college, I liked playing guitar and singing, so I signed up for a vocal class and wanted to practice my voice scientifically. The teachers in that conservatory are very kind to me. She said I was a good baritone, hahaha. She taught me seriously, and explained and demonstrated me from the aspects of singing posture, state, use of breath, articulation, mood and so on. I studied intermittently for two semesters, and I usually practice when I have nothing to do. When I was a sophomore, I obviously felt that my Mandarin was very standard and my voice was very loud, so it was easy to control the rhythm of my speech. This may be what everyone said.