During senior school years there is already a lot to get a handle on: puberty, school work, relationships, and then your parents make a choice that can have a huge impact on you. It can feel like the rug has been pulled out from under you. There are ways to deal with it and although you may not be able to influence your parents' choices, you can control the path that the future takes.
You might not like the people that have been introduced around you. You may feel angry and resentful, but only you can change those feelings inside you. Without addressing those feelings now, things will never improve, and this could affect you throughout your own relationships.
If you can't talk to your parents about your feelings, talk to your friends, a close teacher at school, or another relative. You must explore why you're feeling the way you do. If you can't find anyone you trust to talk to, see your GP. There are lots of ways he or she will be able to help you. Bottling up your feelings will only make the situation worse in the long run.
It may not feel possible right now, but the situation can get better; there is always a way to influence your happiness, it's just not always easy or comfortable to find it.