Sometimes one of the best things you can do (although it might be difficult) is just talk to your brothers about your frustration. I don't know about you, but right now everyone is busy with classwork and other extracurriculars, and everyone is stressed out. It's easiest to just take it out where you can, and for many of my sisters, it's been on each other. So talk to them. But don't fight with them. If you still feel that nothing has changed, there's nothing wrong with just taking a step back from things. You don't have to be at every event that happens, and you should never be expected to give more than you feel comfortable with. And it seems to me that you don't mind giving every ounce of your energy, but you have to remember to take care of you first. And feeling frustrated isn't going to help you one bit.
I hope you can work things out with your brothers.
