I am not completely sure whether or not I have an eating disorder.
What is it that makes you think that you have an eating disorder in the first place?
I sometimes worry about my food intake, and thought about my diet. But I didn't know if it was a true or just a fleeting feeling.
It can be normal to spend a little time thinking about what you are eating, most do. That being said if you are at all concerned it could be more, then you should see a doctor about talking about what is bothering you.
I'm worried that I don't have a problem at all, but it wouldn't matter if I did.
Well if you think you have a problem, then odds are you do. Do not worry about being wrong, just go and talk to someone just in case. It is very important to take the steps necessary to care for your mental health, as this is your sanity.