Is it safe to say that during the first date, you can’t stop thinking about how unlikely it is that a second will follow? If so, it’s a self fulfilling prophecy. To your date, you’ll seem in your head and insecure. And your self consciousness of that fact will perpetuate your belief, and it will come true.
Screw the second date. If you’re convinced it’s not coming, fine. Enjoy the first as if it’s your last. You might be surprised how much you both enjoy yourselves.