Be yourself!

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Across
  1. 3. Having force
  2. 4. Bullying
  3. 9. Adolescent
  4. 12. A manifestation of support or protest
  5. 15. Class
  6. 16. Boring or unpopular person
  7. 18. Solitary
Down
  1. 1. Exclusive group
  2. 2. Protective
  3. 5. Mental representation
  4. 6. Rejected
  5. 7. In union with each other
  6. 8. Unsociable
  7. 10. The state of being depressed
  8. 11. A second-year student at a secondary high school
  9. 13. Have in common
  10. 14. Joke
  11. 17. Be courageous enough to try