I have an idea how you feel. I once went through an awful breakup.. and I lived with this gal for a few years. I could hardly function, everything reminded me of her. I couldn't eat the same foods, or even do the same activities.. it was bad. I would stare at food and just chew.. the bed always felt empty, and the world just seemed a bit darker. After awhile, I learned to make new foods, and do new things that wouldn't make it so hard. I devoted a lot of time to school and a good friend of mine would take me out to distract me.
It hurt really bad, but you'll pull through. And the thing is, I was a lot older than you are, and it's still not easy. Keep strong and lean on your good friends.
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I've got spurs that jingle jangle jingle.
As I go riding merrily along.
And they sing, "Oh, ain't you glad you're single?"
And that song ain't so very far from wrong.