Hey Foster,
I'm really sorry that your mum reacted that way. I agree with an above poster that you could try seeing the school counsellor once school starts, but if the country you're living in has suicide hotlines or hotlines for teenagers, maybe you could call them and they would be able to help you outline the options that are available, given your age and where you live. I don't know where you live, but the TeenHelp site does have a list of such hotlines in a few countries:
http://www.teenhelp.org/hotlines/
I hope this helped somewhat, and feel free to
PM me if you ever need to talk!
Kyra