Tw discussion of suicide &amp; sh

I almost certainly have schizophrenia , my brother was diagnosed with schizoaffective at 18-19ish. I’m currently 16. I’m on antipsychotics and have been hospitalized with a history of hallucinations and delusions  with suicidal intent  and self harming as a direct cause of my expected schizophrenia. I thought it was impossible to receive diagnosis under the age of 18. It according to my mom it’s possible, however rare. 

If I’ve shown so many symptoms in such extreme manners and existing for a semi long period of time and have been put onto many antipsychotics I’m a little confused as to why I haven’t already received a diagnosis. Should I start pushing for one or ..? I have a medication management appointment on the 20th and therapy on the 15th. It’s feeling like a lost cause right now. As I’ve been medically recognized I think I feel like the next step towards my recovery would be diagnosis but I could be wrong here. 

Should I just wait it out until I’m 18 or begin pushing for diagnosis now ? How big do you think diagnosis truly is ?