Is castration for men forbidden by Islamic law, and if so, are there herbal or chemical sexual sedatives?

There is no disagreement among scholars regarding the prohibition of castrating humans; it is a prohibitive prohibition. What the questioner mentioned about his aversion to women is not acceptable, and he should seek righteous women to marry them, thereby fulfilling half of his religion. This is from the tradition of the prophets and messengers. As for other personal reasons, they can be addressed by seeking assistance from experts or doctors.