How do I stop idealizing girls?

Maybe I’m alone on this, but I’ve realized that once I start to know some girls, and once I start finding them attractive or that I find that I really enjoy their presence, my mind automatically begins idealizing them. I begin thinking that we could be this or that, or things are going so well hopefully it leads to this or that. I understand it’s a really bad trait to have, and maybe it’s just I’m always hoping for the best, but I realize it clouds my mind. I was just wondering if it happens to you guys/girls too? And if it does, how do you guys stop or not allow yourself to be consumed by that?

thanks for reading, this is my first post ever. ?