I’m no Miss New York

What you say when you mean you’re nothing special; sure, I did this, but, I’m humble about it.

Also used as a humble reply to a compliment.

Ethan: Safira your handwriting is so perfect, mine is so bad!!
Safira: I’m no Miss New York.

Safira: I’m no Miss New York, but I wrote a 10-page-essay in two hours.