Problem with school and family.?

Ok I have been an atheist for about half a year. And in the school some Christians found out and told everyone and I mean EVERYONE in the school. Almost everyone hates me because of the choice I made. Whenever these asses talk to me they're like non Christ believer, I hope you burn in hell, or God's gonna send you straight down to hell when you die. I can't talk to a single f*cking person without them mentioning my choice. And now everybody (and obviously everyone in the school is a christian except my friend and I) always talks about it when they see me. Plus should I tell my family? I'm 13 and they still think I'm a Christian should I tell them? They're all Christians by the way.