Oh, babe, trust me, I wish to God I could show you a switch to flip to not have crushes on straight girls.  I feel you on a visceral level, as I too have landed myself in that position this summer (she’s just so pretty, guys, and her accent does stuff to me).  But, alas, no such switch has presented itself to me.  That being said, here are some things I can tell you for sure about it.

• You’re going to be fine, even if it feels a little like you’re dying in the moment.
  
• If they figure it out, they’ll either
• move on with their life and treat you as well as they ever have, which means they’re going to be a valuable friend,
• be a dick about it, in which case they didn’t deserve your affection in the first place, or
• turn out to be less straight than you thought, which is unlikely but a nice fantasy.
• Life is too short to pine away over someone who can’t return your feelings.  That sentence will come back to bite me in the ass with my roommate the next time I insist on keeping my mouth shut to a crush, but it’s true.  
• Let yourself look at other people, see the line of their jaw in the sun and the way the tendons move on the back of their hands, the way their eyes look in the light, hear the way their voice makes the air tremble, and let yourself like those people too.  You’re not betraying her by moving on.
• Moving on isn’t something you can force yourself to do.  It’ll happen when you’re not paying attention.  One day you’ll realize that you don’t feel that swooping twinge in your chest when you look at her, and you’ll miss the feeling a little, but it’ll be gone.
• You’re going to be fine, babe, I promise.  It’s not fun, but c’est la vie.  One day this will be a distant memory, time moves on and so will you.