I'm seriously tired of my life

So. My brother has came back from domincan republic.ever since she's been mean to me. I ask her for something she yells at me. I ask her for simple mc donalds she yells at me. And she took my 3 hundred dollars i had. I could have bought some clothes and shoes i wanted so bad.instead she doesn't even pay me back. I'm 14. And i went to summer school today. I come back she takes my big tv.puts it in his room.gives him an iphone 4s. My headphones. And leaves me with. No charger.small tv.gives him all my clothes ( i dress like a tomboy) . And i'm here like why? Why why why.won't nobody listen to me. When i tell them how i feel they make me cry. When yelling at me. Then my step dad is even worster.yelling me all the time. For no reason.his a police officer. When i tell him sir can you leave me alone i'm really not feeling to good to talk. He said don't talk to me like that! I don't know what to do. It's bad. I just want to make everyone notice life without.me sometimes.

Talk to your friend and guidance consular

Tell a close adult about the issues. Try to stand up for yourself and when you get bullied at home speak up.

Its seems as if you are feeling like you're not the favorite child and your parents make it obvious
I have been in the same situation, here is my advice:
Stay strong, you have a few more years of dealing with it and other than emancipation you will just have to deal with it. It isn't fair. No but I found ways to cope.
Try making some new friends, you wouldn't\'t believe how much talking to your friends about frustrations can help
Make a blogger or blogspot blog When you are feeling really down, write in it about how you feel.getting out the anger of it all that way helps
you can get a workers permit at 15, get a job to make friends if you are unsure how. I don't know 1 person who hasn't made a friend at their job also a job will help you have Independence and buy your own things so they have no right to take them.