I don't know how to get my mom to believe that I have an eating disorder...?

I'm a binge eater and I know it. I've been doing it for about 4 years, but I've just recognized that I have a problem about a year ago.. I have constant thoughts of stopping, and losing weight. I've purged about 6 times, but I don't do it often.. I've tried so many times to hint at it to my mom.. I've even told her.. but she doesn't take me seriously.. She just tells me, "all you have to do is eat right and get exercise." She doesn't understand that it's like an addiction.. I just turned 18, so I know I can go to the doctor by myself.. But I have a hard enough time talking about it with my mom. How can I talk to someone else about it? What if nobody else will listen??? I don't know what to do anymore.. It's really getting out of control. I can tell that I'm gaining more weight. I've even done research and I've looked up treatment centers, but it's scary to go up there alone. I don't know what to do anymore...