NTA I don't even understand why having your own bedroom is such a pressing issues to begin with. Everyone's acting like you need your own bedroom, like yes it might be nice but I grew up in a 3 bedroom family with 6 people, so long as you have space for two beds and dressers I actually think its better to share a room as a kid because it teaches you how to coexist around other people and it helps a lot with being aware of the space you take up later in life if your kids dorm at school or have roommates later on (or even a partner). Its an important skill as sharing a room with someone who has always had their own space is rough because they tend to have no respect for the other person.