Job expresses a profound sense of distress over God’s strict judgment. He feels as though his entire past is being subjected to an overly harsh scrutiny, with God actively searching for flaws to hold against him.
The primary approach among commentators [רש״י, אבן עזרא, רמב״ן, מצודת דוד, מצודת ציון] is that Job feels God is treating him as a rebel. According to this view, God acts as though He is documenting every instance of disobedience in a permanent record so that nothing is ever forgotten. At the same time, Job feels that his numerous good deeds are completely ignored [רש״י]. Alternatively, this intense scrutiny is viewed as an expression of sheer bitterness [רלב״ג, ביאור שטיינזלץ], suggesting that God is simply handing down terribly harsh and bitter decrees.
Compounding this pain is the feeling that God is forcing Job to inherit the punishments for the mistakes of his early years [מצודת ציון, ביאור שטיינזלץ]. These youthful errors are understood either as actions committed before he had reached full intellectual maturity [מצודת דוד, ביאור שטיינזלץ], or as old misdeeds that he has already corrected and fully atoned for [ביאור שטיינזלץ]. Job is deeply troubled by the fact that God exacts punishment for these early missteps, especially since he maintains that he never truly sinned or acted with malicious intent [רמב״ן]. He feels subjected to an unyielding standard of justice, as if God is examining him with the intense, unforgiving precision of someone searching for faults in a peer [מצודת דוד].
A distinctly different, spiritual perspective suggests that Job is not actually afraid of these harsh decrees [אלשיך]. Instead, he accepts God's judgment in silence. In this view, he realizes that the youthful sins being punished do not belong to his current life at all. Rather, they are the spiritual failings his soul committed in the distant past, while dwelling in the very first body of its existence.