How to detach in dating?

Dating makes me super anxious sometimes. I’m attractive, so it’s not like I don’t have opportunities, but as soon as I meet guys I either just feel no attraction or I get so absorbed in the situation so fast (think about them all the time, wonder why they aren’t texting back, etc). I do want a long term partner, but am open to casual as long as there is clarity and boundaries are discussed.

How can I just enjoy it without stressing out so much?