Is it normal that i am starting to dislike my best friend?

I have been best friends with this girl in my class for four years now. We are known for always hanging around together. But recently I have just been really silently frustrated at her. She has taken me away from every other friend that I have. So now it is just me and her most of the time. It's miserable to constantly hang out with her because she is not funny at all, I literally can't remember the last time she made me laugh. She thinks she's hilarious, but it just makes me cringe because nobody else finds her funny. Any time I try to form friendships with other people, she is always there, and she is a really awkward person so I can never make new friends. She has about five things that she talks about. She never talks about anything else and will often exactly repeat sentences. I am so bored and I need to laugh again. She is also really lazy and unmotivated. She never works hard and I can't stand that in a person. I never normally say things like this but it's getting to the point where I just want to escape the friendship and find other people. The only problem is, she has destroyed any possible connections I could have with other people. So I'm stuck, and it's getting frustrating. So is this normal, that I don't like the one person I'm constantly with? Please let me know in a comment if you have any ideas about what I could do about this situation, because I'm starting to think I'm wasting my teen years by being bored and never laughing.