help!

I’m Jasmine im bigger then usual I’m 14 turning 15 I believe im pretty only my head has good features my mom and sister talk down to me and get mad when I stand up for my self I truly want to kill my self idk what to do.
All I do is get criticism I know people judge due to my weight ive tried every thing I never tell any one every thing only one person or two know and that’s my therapist I got from freaking school not my mom . And my friend where her mom yell’s at her also but not like mine does.
I know it sounds dumb but there’s so much more I need some one to talk to other then a telephone operator
Please some one help me !!!!!!!!!!.