How do you get rid of suicidal thought!?

There actually not just thoughts considering I have attempted a few and if I wasn't so chicken I would be dead now. I'm 14, 15 next week. Honestly I don't know why I have them.. I've just always had them since about the time I was 10. My first attempt I was 10 and I jumped off the roof. I was fine, but a little pissed. I think it has to do with the problems with my mom and sisters. They all hate me (seriously. no exaggeration). She's sure to tell me this everyday, and I've always felt that one of these days she's going to kill me. She has hit me a few times, but not a lot. It's mostly just because she threatens to kill me, which I reeeeally was scared for my live last month when she put her hands around my throat and around 6 today she threw a bat at my head. I guess it's because I want to kill myself before she does? Idk. Sometimes I just want to kill her but I think about all the nice things she has done for me. My last attempt was swallowing ammonia. Of course I'm alive, but now I'm alive to say I give up and how do I end my suicidal thoughts? Please help if you can.