While it's a key plot point and the ultimate goal of the story, he doesn't have to find it to survive or to prevent Voldemort from getting it.
Here's why:
* Voldemort's plan: Voldemort is after the stone for his own immortality. He doesn't need Harry to find it for him.
* Dumbledore's plan: Dumbledore knows about Voldemort's plan and has set up elaborate safeguards to protect the stone. He's confident that Harry won't be able to get it, even if he tries.
* Harry's journey: Harry's journey is more about personal growth and discovering his own magical abilities. He faces many challenges and learns valuable lessons along the way.
Ultimately, Harry *does* find the stone, but it's not because he had to. He does it out of a sense of responsibility and a desire to stop Voldemort.