Why do i feel this way at the age of 14?

I feel tired exuasted all the time no matter how much sleep I get. With school I have no time to get breakfast. I am forced to either not eat lunch or vomit it up. I fel this way on not only week days but on weekends too. I always walk like I haven't slept sence midnight. When I do eat its healthy foods so I don't think that could be it. I have lost interest in doing everything except laying down.