Now I'm not ugly at all, I'd say strong 7 on a good

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Now I'm not ugly at all, I'd say strong 7 on a good day. Every now and then, and this doesn't happen often at all, I'll get hit on by a girl or I can tell that they're checking me out. What the hell do I say or do? Here's an example.

>At Bk drive thru
>There was some confusion at the speak, but I was totally polite about my order and we cleared things up, the girl seemed to find me funny.
> pull up to window.
>qt girl calling me "love" and "baby". Looking at me frequently as she hands me change.
>I get my food, and I look one more time to just confirm she was hitting on me
>She's staring right at me.
>I drive off like a scared beta bitch.

I don't know why I panic or get scared, I like the attention but I stress and overthink how to not be a creep but suave at the same time. This has happened like 10 times, how do I grow a pair?