* It's vague and ominous: The prophecy itself is very cryptic and open to interpretation. This leaves Percy feeling uncertain about his destiny and what exactly he's supposed to do.
* It predicts his death: The prophecy clearly states that "a child of the big three shall be the hero, but he shall fall." This is a constant weight on Percy's shoulders, knowing that he might not survive the challenges ahead.
* It isolates him: The prophecy sets him apart from other demigods, making him both feared and envied. This makes it difficult for him to make close friends and feel truly accepted.
* It fuels his anxieties: Percy constantly worries about fulfilling the prophecy, and whether he'll be able to live up to the expectations placed upon him. This leads to feelings of inadequacy and pressure.
* It's a constant reminder of his parentage: The prophecy directly references his father, Poseidon, and his status as a child of the Big Three. This makes Percy feel like his identity is defined by his father's power and not his own.
In short, the prophecy is a source of great stress and anxiety for Percy. It creates a sense of isolation and fear, and it makes it difficult for him to live a normal life.