so Mary is blessed and very lucky to have recieved these graces.
Mary is blessed in that she received an abundance of grace from God, including being spared from original sin. Is Mary lucky? I suppose in the sense that we are all lucky that God has offered his grace to us and given us the sacrament of baptism so that we can also be spared from original sin. And always remember, original sin is a consequence of our first parents - Adam and Eve -freely choosing to reject God’s command.
In the discussion about Mary, a lot of very very good comments were made about the grace that Mary received. But I haven’t seen much comment on the other component in play here, the free choices that Mary made in conjunction with God’s grace. Grace is not forced upon the recipient. It can be rejected. To Mary’s great and everlasting credit, she did not do that.
How many of us (assuming by “us” we are referring to women) would have responded like Mary to the Angel Gabriel? Here is what the Catholic Encylopedia has to say:
*And the angel having taken the figure and the form of man, came into the house and said to her: “Hail, full of grace (to whom is given grace, favoured one), the Lord is with thee.” Mary having heard the greeting words did not speak; she was troubled in spirit, since she knew not the angel, nor the cause of his coming, nor the meaning of the salutation. And the angel continued and said: “Fear not, Mary, for thou hast found grace with God. Behold thou shalt conceive in thy womb, and shalt bring forth a son; and thou shalt call his name Jesus. He shall be great, and shall be called the Son of the Most High; and the Lord God shall give unto him the throne of David his father; and he shall reign in the house of Jacob forever. And of his kingdom there shall be no end.” The Virgin understood that there was question of the coming Redeemer. But, why should she be elected from amongst women for the splendid dignity of being the mother of the Messiah, having vowed her virginity to God? (St. Augustine). Therefore, not doubting the word of Godlike Zachary, but filled with fear and astonishment, she said: “How shall this be done, because I know not man?”
The angel to remove Mary’s anxiety and to assure her that her virginity would be spared, answered: “The Holy Ghost shall come upon thee and the power of the Most High shall overshadow thee. And therefore also the Holy which shall be born of thee shall be called the Son of God.” In token of the truth of his word he made known to her the conception of St. John, the miraculous pregnancy of her relative now old and sterile: “And behold, thy cousin Elizabeth; she also has conceived a son in herold age, and this is the sixth month with her that is called barren: because no word shall be impossible with God.” Mary may not yet have fully understood the meaning of the heavenly message and how the maternity might be reconciled with her vow of virginity, but clinging to the first words of the angel and trusting to the Omnipotence of God she said: “Behold the handmaid of the Lord, be it done to me according to thy word.”*
Even with God’s grace, how many of us would have so responded? So getting back to your original question as to why God didn’t create us with Mary’s grace. I think we can only answer it by asking another question: Even if He did, would we freely choose to respond to it the way God desires? Perhaps not. And if not, then maybe we have answered the question.