how to get over an obsession with a girl

I’m gonna make this short because it’s something I’m genuinely getting concerned about but I’m 18 and a female and since freshmen year of high school I’ve been obsessed with this girl who also went to my school (same grade). As a freshmen I would go through her instagram and think she was so pretty and cool. And as time went on I just kept and kept going back to her instagram page. In sophomore year I dressed like her because I liked her style (but grew out of that since I didn’t wanna be a weird copycat) and from sophomore year to now (I just graduated 3 months ago) I have viewed her instagram page almost every day. Whenever I would see her In school my heart started racing and I couldn’t stop looking at her and I always wanted her to look at me.

I’ve never had a full blown conversation with her but she was kind of popular because she was like known for being the weird emo girl and all of my friends said she was weird and a bad person but I never cared because I’ve always been so fascinated by her. The start of my senior year I made a small collection of her from photos on her social media because she would sometimes deactivate or private account and I needed to see her. And just now I wanted to do the same thing because I also stalk her best friend who posts cute videos of her on her story and I want to keep them before they disappear.

I know this is so fucking weird and typing it out makes me genuinely concerned by myself but I don’t know. She’s also going to the same college as me, I saw her at orientation and as soon as I saw her I couldn’t even focus on anything but her. And when she sat next to me during a small activity I swear my heart was racing so bad. I just want advice on how to get over this because I have a boyfriend and I’ve never even talked to the girl, just watched her life through social media. Anyways I know this is super weird but I just want advice or someone to tell me who was in the same situation how they got over this because I just can’t keep living like this like I just feel like a total creep who’s addicted to this girl.