That's because the Adam's apple is bigger. The vocal cords are bigger, the larynx, the house of the vocal cords, bigger. So, during puberty, a man's voice normally drops, because of the size of the Adam's apple and larynx changing.
If you sound like a child, it is most likely that you are not using enough diaphragm support to release your singing voice in a relaxed mode; instead you constrict your throat more, in order to squeeze out your voice.
As you go through puberty, the larynx gets bigger and the vocal cords lengthen and thicken, so your voice gets deeper.
Before your growth spurt, your larynx is relatively small and your vocal cords are relatively thin. So your voice is high and kid-like.
Everyone's timing is different, so some boys' voices might start to change earlier and some might start a little later. A boy's voice typically begins to change between ages 11 and 14½, usually just after the major growth spurt. Some boys' voices might change gradually, whereas others' might change quickly.
Puberty voice change symptoms
The vocal folds change and get thicker and bigger as a result of puberty, and your voice box moves further down.
Your voice during puberty
Puberty is a process of sexual maturation. A voice change is one of the secondary sexual characteristics adolescents develop. In boys, this happens between ages 12 and 16; in girls, between ages 10 and 14.
While it is impossible to permanently change your voice without medical intervention, there are a range of exercises that men can practice in order to speak with a deeper pitch, although their implementation is dependent on the individual and their specific goals.
Once it begins, it lasts about 2 to 5 years. But every child is different. And there is a wide range of what is “normal.” Your boy may begin puberty a little earlier or later and finish sooner or later than his friends.
So while you're noticing some signs of puberty already, it might take a while for other signs to show up. We can't estimate when your voice will change, because everyone experiences puberty differently. But rest assured, you're not alone — plenty of guys find their voices don't change until later on in puberty.
Why do I sound like a kid at 13? Before your growth spurt, your larynx is relatively small and your vocal cords are relatively thin. So your voice is high and kid-like. But as bones, cartilage, and vocal cords grow, your voice starts to sound like an adult's.
Be sincere. Don't fake your manner of speech to impress others. Avoid laughing or joke inappropriately. If someone is trying to be serious with you, and you try to be humorous, you will not be considered mature.
If you talk too long, cheer too loudly, sing too much or speak in a pitch that's higher or lower than usual, you may experience hoarseness. Also, your vocal cords naturally get thin and limp with age. It's perfectly common for your voice to get raspier as you get older.
Before your growth spurt, your larynx is relatively small and your vocal cords are relatively thin. So your voice is high and kid-like. But as bones, cartilage, and vocal cords grow, your voice starts to sound like an adult's.
Boys' larynxes grow so rapidly during puberty that they sometimes stretch the capacity of vocal cords. Like a guitar string pulled too tight, the cords issue pitched squeaks, cracks, and croaks.
When you go through puberty, your voice deepens. Men's voices often deepen up to an octave, while women's voices usually move about three tones lower. After puberty and well into older adulthood, some people's voices may change, but not everyone's. Men's voices tend to go up in pitch.
Strain and tension – When you are nervous, you may experience a tight voice that tends to crack. One reason for this is tension in the muscles surrounding the voice box. Another possible cause is that when you are nervous, you don't breathe effectively, which can also lead to interruptions in voicing.
Puberty voice change symptoms
Because the larynx grows so much bigger in a boy, it becomes visible as the Adam's Apple. Once this reaches full size, you're through puberty voice change. You shouldn't experience pain or strain when singing through puberty. If you're singing and this happens, you need to rest.
The deepness of a voice is primarily determined by the length and thickness of the vocal cords. Longer and thicker vocal cords produce lower, James Earl Jones-like pitches. So, if you want a deeper voice, you just need to thicken and lengthen your vocal cords.
Tenors are the highest male voice and, like sopranos, they are capable of delivering thrilling high notes and often have a brilliant shining timbre.
Consequently, singing voices for women are usually a little higher than for men, with the highest female voice (soprano) reaching C6 and the lowest one (contralto) going down to E3, while the highest male voice (countertenor, typically in falsetto) may hit E5, and the lowest one (bass) can drop down to E2.