Expecting too much?

I went on a date with a guy who I was extremely attracted to from his photos. He was still good looking in real life but not as much as I imagined. I was super super nervous at first but the conversation was amazing, I really enjoyed it and had fun. He asked me out again but now I’m overthinking...

I thought he was good looking but didn’t have this urge to have sex with him or anything. I didn’t feel like I wanted to kiss him, is this unusual? And today I woke up and I’ve got this nervous nausea feeling and don’t find his pictures attractive anymore. I’m scared I’m actually asexual or something or is this just anxiety cause I’m new to it all?
Does sexual attraction take time to develop or usually strong and instant on a first date?
Expecting too much?
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