narcophilia's Favorite

Okay, so I'm an 18-year-old girl and I belong to a 10 people something clique at school (and they're all girls). We're really close, and most of us always hang out with each other and talk about the most random stuff. Sometimes we'd also talk about guys like who's hot and whatnot, though that's not the main interest of my clique.
I've only ever had crushes on guys, ever since grade school. Just about a year or so ago I was still dating a guy in my class. But now I've found myself having the same kinds of feelings for a friend in my clique. I've been observing to see whether I'm just confused or influenced by social media or manga, but mind you, I don't even read yuri and shojo ai. But that girl is very kind and sweet to me and I think I've probably had a crush on her. I'm at a loss of what to do. I talked about this with another friend in my clique (I didn't tell her specifically who my crush is) and she advised me to continue talking normally instead of putting some distance. Normally I'd identify myself as straight, but I'm pretty open-minded about sexuality so I wouldn't find this strange. I just don't know how I should act around her. :((((( I don't want to ruin/change our friendship but at the same time being so close to her every single day is bad for my heart. What should I do? And should I talk about this with other close friends or should I just keep this to myself? My parents are very old-fashioned so there's no way I'm gonna tell them. I can probably endure till graduation and get over her (the only solution I can think of) :(((((