I would try talking to your friends and be honest with them about hurting your feelings. They might not know they're making you feel that way! Next time they tell you about the cool stuff they're doing, make sure you're being supportive, but tell them about what's going on in your life, too! If they don't want to listen, you might want to try finding a few new friends to spend time with in addition to those girls. And even if you're not in the band, you could still do other fun stuff with them! You don't have to have the same talents to be friends, so try supporting the band and telling them about your abilities too

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My best friend and I fight over the stupidest things but today she was saying "uve been a bit immature lately not that i care but i noticed" because we were talking bout something I said to a friend and I felt bad about it, I was going to say sorry to him when I saw him next time but still felt bad. She supposed to be my best friend and shes commenting on my maturity on that. It really annoyed me. So I started getting angry and she stopped replying cause she doesn't want to fight. But its seriously annoying me. We've been fighting a lot and I'm really just getting tired of her. She seems to think being mature all the time is right. I can understand to be mature in certain situations but being mature all the time is growing up too fast, I want to enjoy my time when I can be immature before I'm an adult and need to be mature. Its seriously annoying me about her, fighting and her trying to be mature basically all the time, what should I do?

Maybe she was just concerned for your friend, though there are definitely better ways to handle it. Try having a calm conversation where you tell her that you understood where she was coming from but that you wish she would express her concern in a more constructive way, because it hurts your feelings when she calls you immature. If you both explain your side it will help you get along in the future!