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don't bother to answer that question, no matter what you say to that, you are just qualifying yourself, just change the subject to make it about her quailifying herself to you instead.
but if you really want to anwser that, the the best i can offer is "I didn't come here to talk about myself, I am here for a wild night out, come with me lets dance" just lead her to the dance area and have fun or you can use alternative
wow...how many times did that reply work for you?
If a girl asks you "do I know you?", it's a great opportunity to give her a playful answer.
I usually quote the guy from dos equis - the most interesting man in the world:
"my charm is so contagious, vaccines are made for it"
" I once had an awkward moment, just to see how it feels like"
you do that with a playful/exaggerating tone, she will burst out laughing and will initiate conversation for sure.