I constantly imagine myself living my life with a girl I met

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I constantly imagine myself living my life with a girl I met when I was ten (around 15 years ago). I remember how she looked like, but I don't remember how she behave around me, the things we did, not even if we were good friends or if she liked me. I just somehow became obsessed with her. And since I don't remember how she was, I filled the void with characteristics that were appealing to me. So I end up creating the perfect girl for me. Now, the problem is that I have a girlfriend, I have friends, I have a somewhat active social life, but everything seems boring and uninteresting compared to the things I think I would live with her. Sometimes thinking about her is like a placebo that helps me to get through difficult situations. But I think it's not healthy being satisfied with a thing like that, when I could go out and try to experience the real thing.

I think that all of this would end if I look for her and see with my own eyes that she's not the girl I met and later imagined. But I don't think I'd be able to find her, so do you have any advices?

Thank you in advance!