Thank you for being courageous enough to write in with your question. You do not need to feel stupid or ashamed for the issues that you have been having, but you do need to get some help. Eating disorders can be complicated and are too serious to handle on your own. You took the first step by writing in to this site, now it’s time to talk to someone there who can help you.
I would suggest that you start with your parents — you could even show them the letter that you wrote. But some other adults who can point you in the right direction might be your school counselor or nurse, or your family doctor. There may not be a specialty clinic where you live, but I did a quick online search and there are therapists in your city. Please speak to someone soon so that you can turn this around and enjoy your teenage years.
All the best,
Dr. Holly Counts