What am I?

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Across
  1. 3. People live inside me
  2. 5. I am a very dangerous animal, with big and sharp teeth
  3. 8. I don't exist, but I have a very shiny horn
  4. 11. People sit on me
  5. 12. People love to come here when it is hot
Down
  1. 1. I don't exist anymore. But when I did, I was very big and dangerous
  2. 2. I give people stories
  3. 4. I have a mother, a father, a brother, a sister, an aunt, a uncle, a grandma, a grandpa and cousins
  4. 6. I can write and draw
  5. 7. I can be a clock, a ball, an eye or a wheel
  6. 9. People put their things inside me
  7. 10. I tell the time