How Do I Stop Them Copying Me With This Serious Stuff?

I sort of have an eating disorder and im getting help from my guidance teacher at school. I told my friends and one of them has started copying me with it making out she has a problem which she doesnt, well I fell out with her because of it and then we made friends again but now she has started copying with it again. She copys everything I do…same bag,mobile thing,Glasses,EVERYTHING and it annoying me now that shes copying the eating disorder. Also my other friend found out I was self-harming so I admitted to her. She said I shouldnt do it and that she would never do it then about a week later she started doing it and came up to me and said ‘Omg I have started cutting, im not copying you’ She had a tiny little mark and made out she was cutting. I was like What the hell so I just said hmmm…I mean why do people have to copy you with something so serious like this…why cant people just live their own lives and not copy others. Its annoying…

how can I stop them copying me when they are only copying to get attention because they know that im gettng help and care from my guidance teacher??