How do deal with constant anxiety?

Okay so ever since summer began, all ive ever been thinking about is will i get acceped by uni, and lots of my friends are getting their results and I havnt got mine yet, I just keep freaking out that I have failed and I won't get into uni, like im not sleeping at all and im always stressed out, how do I deal with all of this pressure? Thanks for everyone taking their time to respond means a lot to me thanks ^___^
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