Hi Kamryn!
It's nice to 'meet' you! I'm Victoria, and I'm 18.
I've read your post, and I'm really glad you've reached out for help! I'm by no means a mental health professional, but *mod edit* I myself have (very recently) struggled with my very own food addiction.
I think you have a very positive outlook on your situation; as you've said your parents will have a very difficult time understanding your actions and how to deal with them appropriately, and, while it's not your fault that you have certain impulses (a lot of this do have to do with your environment and body), you haven't victimised yourself. The most important first step is realising that it is, indeed, your responsibility now to take action and change your life for the better, and that that's very much possible.
While I never had what would be classified as an eating disorder, I have faced a lot of the same emotions and problems, such as binge eating, wanting to eat in secret, excessive guilt, and etc. etc. However, I am also a certified personal trainer and fitness enthusiast, thus I've since turned my psychological reactions (in terms of food addiction and a prior panic 'disorder') into curiosity and learning opportunities. I've talked to people, done some research, and seen some first hand accounts, and it's helped me see the bigger picture.
Sorry if I'm rambling a bit, it's just that I'd really like to help you get to a better place, and it would be a pleasure if you would accept what help I can offer you on a level of peer support
I'm not sure what other information you might be looking for right now, but please do respond (I'll try to check back often) *mod edit*
Look forward to hearing back from you,
Victoria