What can i do about my bulimia?

i give my mom signs that i have bulimia like talked about bulimia very very much and like I'm not really happy with my weight and i asked her what would she do if i had bulimia and then she just laughed and said i know you dont have bulimia i would not belive that too. even if you woul dsay you have it. i dont know what to do before it gets worse ( im in the beggining of it now) ...