I feel like something is wrong with me, but I don't want to tell my parents.
This sounds serious. Why don't you want to tell your parents?
I'm afraid of telling them because maybe there really is something wrong with me.
I understand, how that can be frightening, but so is not knowing. Neglecting your health concerns can be dangerous. You should talk it over with your parents since they will do everything they can to help you.
I know what I'm doing. I'm going to ignore it.
If you don't want to talk to your parents directly about what you are feeling, at least go to a doctor. The doctor will examine you to see if there even is a problem, and will help you if they find anything. Ignoring the problem will just make it worse, if there even is an actual problem.