Why is the questioner not sexually attracted to women, despite his repeated attempts and his desire to marry and start a family?

Trust in Allah Almighty and know that He is more merciful to you than you are to yourself. Attach your hopes to His exalted presence, and do not allow despair to find a way into your heart. Increase your supplications that Allah may grant you a righteous wife and offspring. Do not let what you know about yourself prevent you from marrying.

And if you do not find your cure with doctors, then your cure is in the hand of Him about whom Ibrahim said: "[And when I am ill, it is He who cures me]" {Ash-Shu'ara:80}. Therefore, you must resort to legal ruqyah (definition) (exorcism), perhaps Allah will relieve you of what you are experiencing.

If you do not find a result, then know that this world, with all that is in it, is not worth the wing of a mosquito, and that it is destined to vanish and perish. So, raise your head high towards a Paradise whose width is the heavens and the earth, in which there is what no eye has seen and no ear has heard.

Remember that among the scholars and saints, there were those who lived for knowledge and religion and did not find anything that compelled them to marry, such as Imam An-Nawawi and Sheikh Al-Islam Ibn Taymiyyah.