It's only been a few hours. Do whatever it is you do to relax / clear your mind. Go for a run, listen to some music, etc.

Long term success has a great deal to do with how you respond to challenges or failures along the way. Also, it's important to try for some perspective. It's easy and tempting to view college admissions as a referendum on your worth as an individual.

After all, for many folks it's a first chance to actively choose / be chosen by a group, and the "start" of your independent adult life. But as much enrichment and opportunity as any good school will provide, it's not going to define who you are and what you do with your life.

That's up to you.