There is something wrong with my bestfriend...?

My best friend is always trying to copy me (not in a good wayy.) And i think it is completely ridiculous! Because she is harming herself when there is nothing wrong with her! Ok well i havee problems, i self harm, and have Bulimia. And she tried cutting herself right after i first told her i did it! And then she tried to become anorexic! I dont know if she is just wanting attention or what but its annoying and to tell you the truth i think she is sick...because i really dont know if she really wants attention i just think she wants something wrong with her...is there lke a sickness/dissorder when u just want something wrong with u? Lke how everyone wants a cast or sometihng...but this is wayy worse and im worried bout her...thanx :)