What is the solution to the problem of inclining towards males instead of females, while sufficing with masturbation to avoid forbidden fornication, especially since fasting and marriage are difficult for the questioner?

The solution to what you have been afflicted with is to return to Allah the Almighty and turn to Him, striving in His worship, drawing closer to Him, seeking His help, and supplicating Him to avert evil and indecency from you. Be mindful that Allah is aware of you and be ashamed before Him that He should see you doing what He dislikes. Reflect upon death, the Day of Resurrection, and its horrors. When these meanings take hold of your heart, they will instill in you fear of Allah and shyness before Him, and this will lead you to abandon disobeying Him. Increase your supplications. The inclination towards and desire for males is a deviation from the natural disposition (fitra), so resist it by realizing its abhorrence. Increase your remembrance of Allah and recitation of the Quran, and attend lessons of knowledge and gatherings of remembrance. Abandon the sins that lead to this heinous act, such as unlawful gazing. And increase your fasting, for it is among the most beneficial remedies for what you are suffering from.