If you took the test you probably suspected you had it already, so you must have noticed symptoms in yourself already? I think you won't know for certain til you've been properly diagnosed, these tests online are a guide but they're not really 100%. I took a test once for an eating disorder and it said I didn't have one, but I was anorexic at the time, lol. I think you need to sit and talk to a therapist.

Try not to be worried. If you ARE diagnosed with it nothing will change except for you will get help specifically to help you with it, which will be a good thing.