Why does a girl feel worry, sorrow, and stress despite her diligence in worship, her constant seeking of forgiveness, and her avoidance of sins for fear of God's wrath and punishment, while she sees those around her living in peace of mind and tranquility without this degree of commitment?

Praise be to Allah for repentance from sins, but one should not be hasty in expecting an answer to supplication; for Allah may store the answer for the Hereafter or avert evil by it. Do not compare yourself to those who are less in worship, but rather to those who are more obedient, and know that Allah is free from need of your worship and is not questioned about what He does. Patience during deprivation and gratitude during bestowal are obligatory. Do not say that Allah lies in wait for your mistakes, for He rejoices at the repentance of His servant. Sadness and worry are caused by attachment to this worldly life, and their cure is to turn away from it and turn towards Allah, for no worry befalls a believer except that Allah expiates some of his sins by it.