Monasticism or monkhood is a religious way of life in which one renounces worldly pursuits to devote oneself fully to spiritual work. Monastic life plays an important role in many Christian churches, especially in the Catholic and Orthodox traditions as well as other faiths such as Buddhism, Hinduism and Jainism. In other religions monasticism is criticized and not practiced, as in Islam and Zoroastrianism, or plays a marginal role, as in modern Judaism.
Thank you for your question. Asceticism is the renunciation of worldly pleasures and has different degrees, whereas monasticism is where a person renounces the worldly life in order to solely devote themselves to a spiritual one, usually remaining celibate and distancing themselves from people in a convent or a similar institution. Monasticism and celibacy are not allowed in Islam.
A level of asceticism is desired and in our traditions, it has been expressed that asceticism is not that you do not own anything, but that nothing owns you. Meaning that what is important is that a person develops past an unhealthy relationship with material things, so that they do not become a source of distance from God, or make us do what is not right.
May you always be successful.
Jesus (A) was unusual, given that he was not created in the same way as other human beings, so he could be considered as a special case.
Anyway, it is not necessary to marry in Islam. One is allowed to marry or not to marry. What one should not do is forbid marriage or tell people that it is religiously better to be celibate.