Done vs. Finished

Pet peeve #1...Lord knows the English language is tricky and, the older I get the use of "ence" and "ance" gets harder to remember....but the use of the word "done" instead of "finished" really gets my goat!...as in "I'm done eating" instead of "I've finished eating"....as my mother used to say " you are not a batch of cookies, you are a person". Nowadays that seems quaint, but it still rankles me when I hear it.