Has Allah Almighty permitted in the Noble Quran marriage to "what seems good to you of women" for those who cannot achieve it in their reality? And is the concession of marrying more than one, along with the issues of "what your right hand possesses" and temporary marriage (mut'ah), exclusive to the wealthy and the prophets, or are these rulings for every time and place?

Polygyny is permissible in Islamic Sharia for a man, allowing him up to four wives, provided he treats them all justly. It is not exclusive to prophets or the wealthy but is permissible for anyone who can fulfill its conditions. As for slave-girls (malak al-yameen), their existence is rare today and may occur in the future if its cause arises. The verse "So for a enjoyment you have had from them, give them their due compensation" (Quran 4:24) refers to a valid marriage (nikah sahih), not temporary marriage (nikah al-mut'ah), which was permissible then abrogated and forbidden forever. What you mention about the happiness of disbelieving societies due to vice is incorrect; their people suffer from depression and perversion. The existence of desire is not a flaw, but it becomes ignoble if it leads a person to commit forbidden acts and becomes their ultimate goal. The hardship you feel is not from religion but from Satan and weak faith. Fear Allah and turn to acts of obedience and远离 sins, and you will find the sweetness of faith. Look at those below you in worldly matters to appreciate Allah's blessings upon you.