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Puberty isn’t yet completed
Each teen goes through puberty at a different stage of his life. During puberty the voice starts getting deeper as testosterone enlarges the larynx and vocal chords.
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Low testosterone levels
Low levels of testosterone can prevent a man from developing a deep voice.
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You feel anxious around people
Emotions such as anxiety can make a voice high pitched. If you always experience anxiety around others then you might not be talking with your real voice.
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You speak fast
When a person speaks fast his voice can sound less deep. Speaking slowly can make the voice sound deeper. (See How to have a deep voice?)
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You are speaking with close friends
Studies have found that a person’s voice pitch changes according to the people they are talking to. It was found that a man’s voice might sound deeper when he speaks to a woman he finds attractive and less deep when speaking with intimate friends.
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Too much alcohol
Studies have shown that too much alcohol consumption can lower testosterone levels. This could in turn lead to a high pitched voice. (See How does it feel like to have high levels of testosterone?)
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You are still young
Even after puberty ends a man’s voice still become a little deeper later on. By the end of twenties the voice stabilizes then it can deepen again after the age of 45.
