My best friend read my diary. How do I talk to her about it?

We are in our 20's. This is something that we all know we shouldn't do by this age. I struggle with anxiety and depression and that journal is full of my deepest insecurities and struggles, and she read the whole thing. We have been friends for 15 years and I would never have expected her to violate my trust like this. I feel emotionally raped. Like she has picked apart my brain and now knows things that I never wanted anyone to know. I don't trust her anymore and I want the key to my apartment back, but how do I bring this up without escalating the problem further?
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Sorry, I don't know why this posted under Sexual Behavior. I think I accidentally checked it when I was posting. My bad, guys!
My best friend read my diary. How do I talk to her about it?
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