A sexual disorder exists if certain conditions have been fulfilled. If you recognize your symptoms in a certain disorder, your general practitioner can refer you to a sexologist. He will then investigate the causes of the symptoms. In any case, the symptoms have to be nearly always present during sexual contact and must result in serious distress. It is possible that somebody never has an orgasm, but doesn't experience it as a problem. In this case we are not dealing with a disorder. Try to record for a couple of weeks what the symptoms are, how often they occur and if you can think of a possible cause. You can take this overview to your general practitioner, so that you can explain clearly what your symptoms are. Recording also gives you more clarity.