hy am I emotional attached to a girl I’ve never meet?

So about 2 weeks ago I followed a girl on IG not thinking anything of it. She's a female lead in a Turkish drama .We live halfway across the country from her and I’ve never meet her, but over the last 5 days I’ve become extremely emotionaly attached to her. She is always on my mind, and I’m in a constant feeling of yearning/longing for her. It’s like I only want her, and no other girl. I currently only find her attractive, and I’m constantly comparing others girls to her. I’ve never been emotionally attached to someone like this before. I am pretty insecure about my body wish i was little slim and handsome Why did this happen? How did this happen? I’m lost.