Am I just a bitch?

Hey y’all, so here’s the deal. My best friend and I have been so close for 11 years. Met in 5th grade and have been inseparable since. Even when we first went off to college we would call and FaceTime all the time still. Well for the past year (roughly), I don’t know what changed but everything she does pisses me off. Like things she has done the whole time, now drive me completely insane. We don’t really call anymore, but we still text. Even when we are in person I have like a decent time, but over 50% of the time I am just so annoyed and would rather spend time alone. Have I just become bitchier or something? I get upset by how annoyed with her because I mean she is my best and all and I love her but recently it’s been so frustrating. I don’t wanna like stop being friends with her because what if it’s just me going through a phase of annoyance or something?? It’s not normal to not want to hang out with your best friend! What do I do??