Divine revelation is rarely met with immediate acceptance. Often, a person feels deeply inadequate when faced with a monumental mission. The prophet's first response to his new calling is absolute hesitation, driven by the vast gap between his lofty destiny and his reality as a young, inexperienced individual. He cries out in genuine pain and deep worry [רש״י, מצודת ציון, רד״ק], expressing profound distress over the personal limitations he believes disqualify him [מצודת דוד, ביאור שטיינזלץ].
His primary argument is an inability to speak. This is not a physical muteness, but a lack of the polished, eloquent language required to properly deliver prophecy, a skill that demands years of practice [מצודת דוד, מלבי״ם]. More daunting than eloquence, however, is the terrifying task of delivering rebuke. Moses himself only dared to reprimand the Israelites at the very end of his life, and only after cementing his authority through massive miracles like the Exodus, the splitting of the sea, and the giving of the Torah. For a brand-new prophet to suddenly stand and rebuke an entire nation seems impossible [רש״י, רד״ק, צאינה וראינה].
He blames this inadequacy entirely on his youth. While one view suggests his youth merely indicates a status of servitude or subordination to greater figures [רד״ק], the primary approach among commentators is that he was literally a young boy. Calculations of his long prophetic career, which stretched past the destruction of the Temple, suggest he was only twelve or fifteen years old at the time, entirely lacking worldly wisdom and life experience [אברבנאל]. This young age presents three practical hurdles: he lacks the courage to confront powerful leaders, he has no rhetorical experience, and there is a very real danger that the people will despise a mere boy, mock him, or even rise up to kill him [מלבי״ם].
Beyond these practical fears lies a deeper psychological and spiritual concern. Youth naturally lean toward being hot-tempered and strict, whereas elders lean toward mercy. The young prophet feared he would lack the compassion needed to pray for the people and cancel harsh decrees, effectively making him a mere agent of destruction. Yet, this strictness might be exactly why God chose him, ensuring the harsh prophecies of wrath would be delivered without compromise [אהבת יהונתן]. Despite these heavy burdens, history shows that the young can indeed receive prophecy, just as Samuel did [רד״ק, צאינה וראינה, אברבנאל]. Ultimately, the prophet's fears are answered by a simple truth: the identity of the messenger is irrelevant. The nation must look only to God, the Sender, because the prophet operates entirely by His power [חומת אנך].