Iin: i want to get out of my friend group?

Okay so, I have been with a certain group of friends for five years (I am now a senior in high school). The thing is, I absolutely cannot stand them anymore, even my best friend (if you can call her that). I've always never felt really close to any of them because I always felt as if every time I was myself and said what I wanted, they would be judgemental. Because of my fear of being judged, I was always the quiet one in my group and never really found a best friend even though everyone else became close with each other. Now more specifically, one of my friends, let's call her X considers me and this other girl, let's call her Y, her bff but whenever all three of us are together, X always chooses Y over me and I am left all alone. The ironic thing is that whenever X isn't at school, Y calls her spoiled and rude and chooses other people over her. So basically, it's a big cycle of my "friends" choosing their closer friends over me and I am left feeling ignored and lonely. Am I just overreacting and is this normal because people drift apart? I really don't wanna feel this way when I go to college in August.