My family thinks I have an eating disorder

Ok so I used to make myself throw up if I ate WAY too much and felt very very sick and it wouldn't go away. I don't do that anymore. Plus when me and my bf started dating he saw me doing it and immediately put an end to it. And I never did it to be skinny cus I'm naturally skinny and can eat for days and days and stay skinny. So I don't have a problem with my weight at all. Anyways so now my mom is making a huge deal out of it, I read messages on her phone sent to my brother saying I have an eating disorder and that she's gonna have to take me to the doctor. I told her once that overeating and feeling sick is the worst feeling ever, but she told my brother that I said having food in my belly is the worst feeling ever. Then last night i threw up (not on purpose.) cause I was sick from my birth control because I hadn't eaten with it, my boyfriend walks in and says what the hell are you doing, he was being protective. And I told him I'm sick so he's automatically like aw baby what can I get you. Anyways now I just ate dinner and was taking a shit and my mom screams my name. I didn't reply cus my boyfriend is in the room right next to the bathroom asleep so I didn't wanna yell. So my step mom knocks on the door and says what are you doing. I said using the bathroom.... she said are you making yourself throw up.. I said no.. she said I can hear you doing it.. I'm like I'm not! Anyways what do I do? I can't take a shit without people listening because they think I strive to be skinny or something when it's not like that at all. I know they're just caring about me but geez it's annoying 😒