I just really need some advice?

i have this thing where i just sit in my room and talk to my dolls. These dolls are porcelain and around my size. Im very short and very thin. my mother says i need to branch out nd get some real friends, but these dolls ARE my real friends. I have Margot, Ally, and Elizabeth. oh Elizabeth is a big girl. well how can i tell my mom that this isnt strange nor is it a problem?please please help me im desperate.