A small note that borderline personality disorder, like many mental disorders, is a complex condition. Specifically, a person must meet 5 of 9 diagnostic criteria in the DSM to be diagnosed with BPD; since they can meet any 5 of those 9, this means that many individuals with BPD can present very differently. This is a weakness of the DSM.
BPD specifically is problematic: it has only been well understood in the last few decades, and has an undeserved reputation due to media portrayals. Even the name is controversial, with the 'borderline' name a throwback to the very early days of psychiatry. Alternative names like "emotional dysregulation disorder" are now commonly preferred to avoid these associations.
All this to say: while the OP's experiences are valid, care must be taken not to generalize behavior from one person with a disorder to other people with the same disorder. This is how stigmas arise.
[Disclaimer: not a professional, have just read a little on these matters and, like many of us in this thread, have known people who struggle with mental illness.]