My life is unfair, what should I do?

Ok here's my story. I'm the oldest in my family and my younger sisters are spoiled. I have had a junky old beaten phone for years, my sisters get a new phone every few months for no reason. A few weeks ago I saw that my sisters had the new iPhone. That was when I fought back. I yelled at one of my sisters on why they received an iPhone, they did not answer and cried to my step mother. I even pleaded my case to my dad and he agreed that because I'm the oldest I deserve a new phone, yet he can't get me one due to my step mother having total control over the phone situation.

The main reason I'm asking this was not because of the phone situation, it's my 13 year old sister. I try my hardest at school and even was placed into advanced English. Yet my sister cheated her way through school and is in all advanced classes. She is the stupidest person you will ever know. I know she uses her phone to cheat in class! She is always praised for how good she does and how popular she is and I'm just siting in the corner trying to tell people that she cheats her way through life because she is " popular"

What do you recommend I do?

Most people's lives are unfair. There's nothing you can do about it. You just have to accept it and try to make the best of it

Take care of you. Be the best you that you can be. You will go far and sooner or later their little ways will be found out. Do all things to the best of your ability not forgetting it is for your benefit and your future. All this stuff going on will fade away once you are old enough to be on your on.grab life and run with it!