Mental illness is rarely tangible. I think there’s a hint of that in you’re post.
Personality disorders are far from tangible and there’s a lot of overlap. I’m sure many doctors make both honest and ignorant mistakes in diagnosing people.
In one sense there is no “bpd” you could point to in a person. When a person consistently behaves, thinks and relates in certain ways over a long period of time and those ways xyz specific impacts on their person - we call the combo of all of that BPD.
I tried to give you the benefit of the doubt bc there’s things in your post that seem naive. Idt you had bad intentions but still.
Kinda hope you are a female bc it makes the “female frustration” SLIGHTLY less problematic than if yr a dude.