 I am 1 cm away from ending it all.

 I've been suspicious that I have BPD for years now and I finally had the courage to go see a psychiatrist. He diagnosed me as borderline and gave me proper medication (antidepressants and a sedative). I went home and I decided, together with my bf (FP) to explain to my parents how Ive been struggling (I've been having severe psychotic episodes and Ive been self harming regularly (auto mutilation *not severe*, starving myself for days, alcohool abuse etc.) these past months.
 They completely disregarded the diagnosis, started saying that psychiatrists are crazy and the guy scammed me, that there's nothing wrong with me, that everyone acts like I do and we all get upset and that I should just go outside (yes during COVID times ikr) and exercise. They also blamed video games for my "sadness" as they called it. The diagnosis clearly stated Borderline personality disorder + Mixt Anxiety &amp; Depression. I don't know what to do anymore. I feel invalidated, like I'm faking it. They forbid me from taking the medication that the doctor prescribed saying that only crazy people ("the ones who hear voices" they said) take those. I don't know what to do anymore. I just don't. I'm thinking of finally getting the balls to cut my veins or hang myself. I'm tired of being invalidated. The moment I felt like I was doing the right decision by getting help this happens. I also told them that I dissociate for hours sometimes and they were like HoW Do YoU KnOw ItS fOr HoUrS...like for real...?

I lost all hope and I just need advice. I have no idea what to do.