I absolutely hate my life

Today was the worst day in existance. Ok. Let's get through it. Me and Kandi have gotten in a bad fight, and I'm not her friend anymore. Ok, so this morning, me and my sister were walking into school onto the campus. And Kandi just comes and grabs my sister away. And she's the only person I could talk to, because I don't have any friends. And my sister just stays with Kandi. And I try to get her back, and Kandi grabs hold of my face and tells me that if I give her any attitude, my ass will be beaten by her. But I just shrug her off and run off to the back of the school in tears. Because I'm a baby....and then she steals Amanda at lunch, and I try to pull Amanda away and she says, "Don't even fucking touch me, sarah!" and I walk off. Alone. And after school, she gets right in my face and says: "You are the biggest fucking jerk EVER!" and that gets me hysterically crying, and even worse, since my sister and Amanda are friends with her, she's getting a ride home with us. And I ACTUALLY have to put up with that! I'm forced to put up with all this shit. And there's nothing I can do about it. My old best friend is threatening to kick my ass. Now that's a problem I just can't handle.