Why do I doubt myself after a first date?

So I just recently went on a first date with a great girl. She was cute, had a good personality and overall we had a lot in common and had a good back and forth. There were some nerves for both of us I think as well.

At the end of the night I asked if she would like to meet up again and she said yes.

While historically I have had a good success rate of getting a second date, I feel like this is always the go-to phrase girls say whether they are interested or not. I'd much rather just have them tell me they aren't interested or they didn't feel a spark than give a false sense of hope.

Is it normal to have a little self-doubt after a first date or am I over thinking things too much?
Why do I doubt myself after a first date?
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