My mom always wants to go out

My mom literally always goes out to the bars and shit and leaves me to babysit my younger sister. Every weekend and almost everyday she’s out drinking. I never get to do what I want because I have to stay home and babysit. Usually parents go take their kids out to do something on the weekends but my mom leaves for the whole weekend to do whatever it is she does.

Well today I had plans that she knew about for days and when I told her again she got all mad and yelled at me. She basically had a hissy fit because she actually has to stay home for once since I’m leaving. It’s just irritating and annoying. I’m almost 18, I should be able to go out and shit and do the things I want to do. She’s almost 40 and parties like a 21 years old, I just think it’s old already.