Is the feeling of hating prayer considered disbelief or a sin, and what is the way to get rid of it?

These questions indicate waswasah (whispers from Satan), and it is advisable to completely turn away from thinking about this matter. Occupy your time with what benefits you, such as acquiring beneficial knowledge, recitation of the Quran, dhikr (remembrance of Allah), reviewing inspiring religious texts (raqaiq), stories of the prophets, biographies of the righteous predecessors, and serving your family. Frequently reflect upon the hadiths that encourage prayer, emphasize its importance, and detail its reward. Strive to supplicate with a present heart, avoid distractions, and remember the Hereafter to achieve khushu' (devotion and humility). Khushu' makes prayer easy and comfortable, as Allah Almighty says: "And seek help through patience and prayer, and indeed, it is difficult except for the humble [in prayer], Who are certain that they will meet their Lord and that to Him they will return." (Al-Baqarah: 45-46).