Hi Dan,
Our first parents were created in a privileged state that we would have inherited, without merit, had they not sinned. In the same way, we have lost, through them the privileges that we would have enjoyed had they not sinned. In other words, we are now in the normal state of creatures without special privileges : subject to the flesh and its passions, mortal and destined to die.
Here’s a more theological explanation from the Catechism of the Catholic Church :
403 Following St. Paul, the Church has always taught that the overwhelming misery which oppresses men and their inclination towards evil and death cannot be understood apart from their connection with Adam’s sin and the fact that he has transmitted to us a sin with which we are all born afflicted, a sin which is the “death of the soul”.Because of this certainty of faith, the Church baptizes for the remission of sins even tiny infants , but for all human nature. By yielding to the tempter, Adam and Eve committed a personal sin, but this sin affected the human nature that they would then transmit in a fallen state. **It is a sin which will be transmitted by propagation to all mankind, that is, by the transmission of a human nature deprived of original holiness and justice. And that is why original sin is called “sin” only in an analogical sense: it is a sin “contracted” and not “committed” - a state and not an act. **
405 Although it is proper to each individual,** original sin does not have the character of a personal fault in any of Adam’s descendants. It is a deprivation of original holiness and justice, but human nature has not been totally corrupted: it is wounded in the natural powers proper to it, subject to ignorance, suffering and the dominion of death, and inclined to sin - **an inclination to evil that is called “concupiscence”. Baptism, by imparting the life of Christ’s grace, erases original sin and turns a man back towards God, but the consequences for nature, weakened and inclined to evil, persist in man and summon him to spiritual battle.
Does this answer your question?
Verbum