Getting into “the right school” makes it easier to hang out with your friends from April through August, when everyone scatters and none of that matters any more. (Covid has messed this up, but stay with me.) Your group will go on to their various schools, and some will blossom and grow and be fulfilled, and some will be frustrated and unhappy, and the rank of the school has almost nothing to do with which kids are happy and which are not.
If you’re a Bloom Where Planted sort of person that just wakes up each day and starts with a fresh outlook and your own sense of place and value then it doesn’t matter where you go to school. If you need constant approval from those around you or a constant stream of successes to feel validation then eventually you’re going to hit a dry spell (everyone does) and be bummed out. And that happens more often when you’re not the smartest or hardest studying kid in the room, which is likely the case at top schools like Stanford. Just read these boards and you’ll find plenty of posts by burned out or disillusioned students at fabulous schools. No matter where you are, there you are.
The root of your problem seems to be disappointment, and disappointment is frequently more about high expectations than poor outcomes. If folks are telling you you are where you belong then maybe it’s true. But I’m guessing your destination is still a pretty good school and not Flathead Valley Community College (no offence, I just love the name) so “failure” might be a bit hyperbolic. Disappointment is real so don’t pretend you shouldn’t feel anything. Feel the hurt, wallow in it for a bit, and then pull on your new school sweatshirt and start buying sheets and a new laptop. Life has already gone on even after your soul was kinda crushed. Life’s like that, and you learn how to handle knocks like this by getting knocked around like this. If you think settling for a good school is bad, wait until you lose a job you love or your heart is broken or a family member dies. You lay there for a bit, start breathing again, and then get up. It’s all you can do. So keep your eyes up and your feet moving and you’ll make it. Good luck.