Know that trying to decide 1000 out of 15000 startups is incredibly challenging, especially given the fact that the application asks for very little data. So don’t ever think you weren’t meant for this, because it is a school program and everyone has the potential to dominate. This isn’t a zero sum game.
As for startup school, there are two critical things: being accountable and having a support network. Everyone will get those things which is great. I’m not trivializing the role advisors play, but YC noted that everyone will get access to advisors in the forums. Some startups will find them a useful resource for specific problems, but you don’t necessarily need them every single week; indeed some startups waived their five minutes some weeks.
Congratulations! Now let’s get to work! :D