Are men turned off by women who overthink?

Hi guys, I tend to have an overthinking problem and I feel like I’m sabotaging relationship because of that. Guys have asked me stuff like “are you a happy person?” Like I don’t know how to stop overthinking stuff when I’m dating guys. The overthinking only starts when I start liking them. Up until that point I’m normal. The second I do, I think some sort of protection mechanism kicks in and I overthink and over analyze his behavior and then end up saying something or the other that gives them the ick. What do I do pls help.