Is considering the hardship of fasting in Ramadan and wishing for its days to end a sin that necessitates repentance?

Fasting is one of the best acts of worship. The noble Hadith (definition) has clarified the status of fasting and the virtue of those who fast, and that Allah rewards for it, and that the fasting person has two joys: upon breaking his fast, and upon meeting his Lord with his fast. Sheikh Ibn Sa'di also mentioned that the immediate joy (of breaking the fast) is a model for the deferred joy (upon meeting the Lord). A Muslim rejoices upon breaking his fast not because of the removal of hardship, but because Allah has helped him complete his obedience. Whoever finds fasting difficult is either excused, so he breaks his fast, or he experiences a tolerable hardship, so he perseveres and completes his fast seeking the pleasure of Allah. As for those who dislike fasting and wish for the month to end, this is an unsatisfactory state and an indication of a soul that dislikes worship.