Eating disorder

I dont have body dysphoria at all, in fact I love my body and feel comfortable in my skin, but I think I have an eating disorder. I'll get nauseous when I try to eat most the time and I can really only snack without feeling sick, though I know its not sustainable to do that. Just the other day my dad forced me to eat a fairly small peice of chicken and I was gagging and crying from trying to hold back from vomiting the entire time but about half an hour later I had a bowl of dry cereal just fine (I dont drink milk) I'll go days without eating because I simply dont have an appetite though I try to remember to eat what I can, hence the snacking. I dont understand whats going on with me. I look healthy, if not a bit chubby, but I rarely ever eat. And this has been going on for about two years now, I cant ask a doctor though because my parents wont allow me to and without them I can't get an appointment or get anywhere.