At the age of 18 maybe you defy definition as so many young people do. Theres so much overlap of syptoms and disorders and diseases that share symptoms that it would take a personal relationship with a clinician over some time to pigeon-hole what you "have" mostly and what are secondary symptoms and keep in mind there are as many ways to be mentally ill and mentally sound as there are human beings walking the earth. You dont need to medicate away your identity and personality but the atypical antipsychotics help many people with the painfull intrusive symptoms of disorders from autistic spectrum disorders to the schizophrenias.