How do I stop creating a guys personality in my head before I actually get to know him or even talk to him?

I always fall for guys I think are cute and assume their entire personality and some factionalized relationship we’ll have before i even talk to him. Then I get let down when he’s not how I imagined.

How can I stop doing this, it basically ruins every chance I have getting with guys I actually find attractive?

How do I stop creating a guys personality in my head before I actually get to know him or even talk to him?
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