AITA for not wanting to be friends with my best friend anymore?

I, 17F, have been best friends with Leah (fake name for privacy), 17F, for about 7 years. I have always been really shy so me and her have always been close having sleep overs and what not but recently I have been questioning our friendship. I have been beginning to make some new friends since I joined our schools band and I finally got a bf who is great. Leah often makes fun of my new friends cause they’re ’weird’ but they are really nice to me and make me feel great. Since being with these people, it’s made me realized how mean Leah has been specifically to me recently and as kids. To give some examples, we sit in our teachers room with two other friends for lunch. There have been time where she has told everyone embarrassing things I’ve done right in front of me as if she’s trying to make me feel bad. Another example is she will randomly make jokes about my body like how ‘flat my butt is’ and other comments that I didn’t really think about until now since they’ve started getting meaner. Even as kids, she wouldn’t let me use her coloring pencils because I ‘pressed too hard’ so I didn’t get to color while she did. Those are just some examples and there are more things. I told some of this stuff to my bf and he was the first to agree with me and say she shouldn’t treat me like that and I shouldn’t be friends with her. I have thought about it, but we’ve been friends for so long and I don’t have another best friend. Am I just being over dramatic? I’m really not sure to do so some advice would be greatly appreciated.