The most obvious change is that you will need to share your home and some of your belongings. Sometimes, children may take your things without asking, or break them. This can be very frustrating, and it is understandable that this will make you angry. Sharing is part of fostering. You may want to ask your parents if you can have a cupboard with a lock where you can keep the things you treasure the most.
It is not recommended that you should have to share a bedroom with a child who is being fostered, although sometimes it may not be possible for everyone to have their own room. It can be very difficult to share your private space, but try to remember that the fostered child does not have any space of their own, and will appreciate you making them feel welcome (even if they don’t show it!).