

Not sure if my camera is clear enough. However, I tried to write:
やった!
わたしは16です!
-ハーリー
I now realize there are some mistakes, such as the ya being slanted right rather than left, and the fact that the katakana ha isn't entirely correct, and that watashi is written in kana.
However, does it make sense grammatically / Is this the correct phrase to use?