Am I being selfish?

Every morning my mom goes to work at 6 AM. I have to get up and go to my parents room to watch my six year old sister, who sleeps in until about 10 at the latest and then we start our day. This is fine because usually I sleep in with her and we cuddle and whatnot but now I've been instructed that we need to get up the moment my mother has gone to work and I need to keep her up. I dont want to be selfish because I know my moms work is stressful but I do basically everything around the house regardless of having a 13 year old brother. He sleeps in until noon or past and stays up all night, I dont even want to do that I just want to go to bed at 11 or 12 and sleep in a little bit which shouldn't be too much to ask for at 16 I dont think. I just want to have some normal teen experiences but they always make me shut up and act like an adult while my brother screws around. Im not allowed to go anywhere, do anything, have anyone over, stay up, or sleep in and its been like this my entire life but with added restrictions in the past six years my sister has been alive because I basically parent her until 5 PM. All I want is a little sleep, is that too much?