Do I have a crush?

Soooo....I have this weird thing that my brain does. I randomly start liking people VERY intensely. I dont even need to know a lot about this person to be obsessed with them. These random obsessions go away pretty quickly tho. And the weirdest thing about this is the fact that I dont even want to actually be in a relationship with them. So basically I get weirdly obsessed with somebody, think they are the most amazing, good looking person on this planet. But irl I dont want to talk to them, I would not be physically attracted to them nor do I want a relationship with them. So what are these called or are they just crushes?