Professionals often deal with this same issue every year. The Nutcracker is a huge money maker for many professional companies and its often thrown together in a matter of 2-3 weeks because so many people have done the ballet before and probably even the same part before.
Assuming you’re at a school, you have to try to look at why that may be the case. Do certain levels do certain divertissments? Are other students constantly repeating the same parts? If so, that may be a problem because students need, and should want, to be challenged to get better.
It never hurts to have a discussion with your teacher. Keep in mind, this doesn’t mean going in to his or her office and complaining or crying. But if you try to have a conversation that has back and forth, it can be quite constructive. Sadly, some teachers/schools try to keep stress as low as possible and just find it easy to continually cast students year and year in the same parts. Hopefully this isn’t the case for you!