How can I ever go back to school , picture of me on facebook!?

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Im 16, my boyfriend is 17. We took a picture of us naked in bed together 4 weeks ago BUT we were both covering ourselves with bed covers so you cant really see anything. My boyfriend uploaded it with the caption "just had sex" as a joke for one minute then deleted it. But someone saved the picture and uploaded it to her Facebook and so far it has about 750 likes and 200 comments calling me horrible names. I stayed off school today and my friend texted me saying that my whole school is talking about me. Also the photo has been reported to Facebook about 30 times but they said that they won't remove it. How can i ever go back to school? If I dont go next week then I won't be able to go to prom but I really cant deal with everyone staring at me and talking about me.

Yes I know I'm stupid for taking the picture, but I didn't plan for everyone to see it. I just need some advice.