Advice for talking to mum about seeing a therapist?

[Jess]

Tomorrow I've decided I want to talk to my mother about seeing a therapist for my bulimia. I've suffered on and off for ove a year now, and my attempts to stop on my own have failed. I don't really know how to ask her, since she's not really for it... and I'm kind of scared. I hate talking about my feelings and opening up to people and stuff like that so I'm kind of scared of talking to a complete stranger... How awkward is it? And i'm terrified that people at school could find out... Honestly I'm terrified by the idea, and I don't really want to quit, but then I read about all the possible side effects of it killing me, and my friends who know keep telling me I should get help so I am, but I don't really want to.I brought up the idea a couple times since she's found out about my little secret but everytime she kind of convinces me to try to quit on my own. How do I convince her it will help?