Why do some girls get crushes on celebrities and fictional characters?

I am a guy, and i really don't understand this at all. of course i have found celebrities and even fictional characters attractive, but i could not see becoming romantically infatuated with them
Update: and i dont know of many other guys that obsess over fictional characters or characters romantically either
Update 2: or celebrities*
Update 3: btw not trying to call girls dumb or anything its just this is something that i can not relate to but seems pretty common
Update 4: @ allanas thanks for assuming that i'm undesirable :/ lol
Update 5: yes i think some celebrities/artists are cool and stuff, but i dont think about being friends or lovers with them a bunch or anything
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