I really need some advice

I’m 13. And there’s been a lot going on lately. My friend is getting worse and worse by the day. She almost killed herself a few nights ago. And while that was going on. Her best friend was ready to kill herself if she did. I’ve always tell them that it’ll get better. But they never listen. My other friend. I found out she was gonna kill herself. But didn’t. And now she’s cutting. Things have happened to me too. My sister is so mean to me. But she tells our parents that I’m being mean to her. Words hit me hard. My best friend calls me fat. Flirts with guys I like. Even though she a) doesn’t know then or b) hates them. And a guy at my school keeps teasing me and sexually harassing me. I also have thought about harming myself. Or starving myself. I feel really fat. I wish it could all just stop. There’s been nights where I was just overwhelmed and cried. I’m 13. I know it weird for me to be sad about this stuff. But nobody else in my grade knows or deals with what I’m having to deal with. Please give me advise. I really want help.