just lost my cat and I feel so stupidly lost

My cat just got killed, I'd only left for an hour to the dentist, and I came home to my dad telling me on the front lawn, someone had picked her up and taken her to the vet. I started crying my eyes out and haven't been able to stop since. She strayed out further than she ever usually does and was hit by a car; she's always usually close to home, and I could never imagine this happening. We're in a new town, and have been for the past couple of months, so she's been my only friend.

Ella was my best friend, and we did everything together. She was such a friendly cat, always wanted to be around everyone, and she slept with me every night. She didn't know how to meow, so she always squeaked. I wish I had gotten to say a proper goodbye to her this morning; she was still asleep in my room. I wish I'd never left at all. She never would've gone out the cat door if I had been home because she would've been sitting with me.

The house feels empty without her already; her bed is sitting waiting for her, and the blanket on my bed is covered in her fur. Her dinner is waiting to be opened by the bowls. I don't know what to do; all I can do is lie in bed alone and cry. I feel insanely upset. She was everything to me, and now tonight, for the first time, I'll sleep alone.