Worried!!!!!!!!!!!!!?

ok so i reckon i have an eating disorder (anorexia) but even though i have all the symptoms of it i havent lost any weight- but i can see my ribs now and my hip bones and collar bones are even more sticky out and this is the 1st time i have actually admitted that i am damaging my health by cutting out all of my calories ect i really want 2 get some help but im only 13 and there is NO WAY i can tell my mum cause she will think im joking around and i cnt tell my skl nurse either cause she will just tell my mum and i do not want her 2 find out! plz help i dont think i can go on like this anymore i just want 2 die from being so fat !!!