Got checkmated

I played black. I guess I did everything right except for the last part which cost me the game.

1. e3 e5 2. g3 d5 3. b3 Nf6 4. Bb2 Nc6 5. Bg2 Be7 6. Nf3 O-O 7. h4 h6 8. h5 Bg4 9. Bh3 Bxh5 10. Nc3 e4 11. g4 Bxg4 12. Bxg4 Nxg4 13. Rg1 Nxf2 14. Qe2 exf3 15. Qxf2 Bh4 16. Rg3 Bxg3 17. Qxg3 Qd7 18. Ne4 dxe4 19. Qxg7# {Black checkmated} 1-0