How do I get over him? 17F

I don’t think I ever experienced love in a romantic way before. No has ever had a crush on me, I’ve never been in a relationship . On top of that I don’t think I ever truly loved someone before. Sure I had some crushes when I was little, and I liked a person for some time when I was 15 but it wasn’t that deep. Even when I like someone I don’t realize it for a long time and when I do a deny it. Maybe I am just this way but I think a part of it is because I am so afraid of rejection, that I even hate the thought of liking someone because most likely the person doesn’t like me back and I don’t want to seem desperate. Recently I realized that I pursue romantic feelings towards one of my male friends. I’ve known him since we were little, but gotten close the summer of 2023. I’m not sure when I started liking him but I think some intentions were always there. Now it’s gotten to a point where I always think about them, wanna talk to them, wanna have their attention, and I daydream about us being together as a couple frequently. I can’t pass a day without talking to them and I lose my mind if they don’t message me first (which has been happening for a few days). I think a might not just have a crush on them but I may love him. I am sure that he sees me as a great friend but I don’t think that he sees me as more. I don’t wanna ruin our friendship just because of my feelings. As I said I am scared of rejection so I will definitely not confess or do anything about it but I am slowly going insane. It doesn’t help that our friends usually ship us and joke about us getting married one day. It hurts to see that other people see that we would be a great couple but he doesn’t and it won’t come true. He is showing some signs back sometimes but honestly I think I might be delusional. I feel so pathetic. How do I get over him and just be his friend?