Need help with bullies!?

all my life i have been bullied! im 16 and this started since the 3rd grade. they call me fat and ugly, an hour ago i got a call from someone i dont know and said "your fat, ugly and disgusting, go die in a whole, stop wearing crop tops they make you look obese" i am no where near over weight, i have no idea who it is but i have been getting alot of calls like that. for 3 years i have been bulimic and cutting myself. when i got the call, i cried so much and i threw up..no one knows im being bullied, but i need help, i dont know how to tell my parents. All my life they have been saying stand up for yourself and they wont help. i really want ot be homeschooled to get away from everything..i hate myself and my body!