there probably is... but as a trait or problem within a specific diagnosis. You don't really say enough to be able to categorize it, but it could be obsession... it could be a mild delusional infatuation... could be a lot of things... but it kind of points toward issues with your own identity. We tend to seek most fervently that which we cannot find or believe we do not have within ourselves... so daydreaming or obsessing on another is telling us that we are seeking something internally through external means

try reading through some of the disorder descriptions and perhas you will find other things you have in common?