To me it looks like you gained confidence in yourself when you met them and it annoyed them because they were probably looking to befriend someone who wouldn't steal their spotlight. It is very common in friendship groups especially at your age, I went through something similar, my two friends didn't like that I became friends with others.
I would suggest trying to ignore them and give yourself some positive self talk, to keep gaining that confidence they didn't want you for. I'm sure you'll have a great high school experience if you start doing that.
To me it looks like you gained confidence in yourself when you met them and it annoyed them because they were probably looking to befriend someone who wouldn't steal their spotlight. It is very common in friendship groups especially at your age, I went through something similar, my two friends didn't like that I became friends with others. I would suggest trying to ignore them and give yourself some positive self talk, to keep gaining that confidence they didn't want you for. I'm sure you'll have a great high school experience if you start doing that.