I hate to say this and I know this is usually a plurality focused blog. but
bpd alone does not cause psychosis.
bpd alone does not cause (hypo)mania.
"but what about the times when I am really scared that the people I care about want to hurt me??" do these usually happen after you've been overthinking, during splitting, during intense emotional states, or during stressful situations (not neccesarily traumatic ones)?
that's a borderline personality disorder symptom. it's quite literally in the diagnostic criteria. plus, this paranoia you feel may be intense but is often short lived, yes? psychotic disorders, primary or not, are CONSISTENT, longer lasting, and require more than just "i was scared people hated me for an hour" (additionally, in regards to that, bpd paranoia is more of an "emotional" manner. you feel people want to make you feel worse or emotionally/mentally harm you, as opposed to physically injure or kill you. persecutory delusions, which are only one form of psychosis, are usually the latter.)
now onto our second point: mania.
mania is a lot more narrow in its definition and expression. similarly to how bpd alone doesn't cause depression, bpd alone does not cause mania. what you are experiencing is euphoria. your euphoria may, on an extremely surface level, look similar. you may feel more impulsive, agitated, and, well. euphoric.
however, somewhat similar to the psychosis point, mania needs to be the majority of the day on most days for at LEAST one week to classify as such. plus, as opposed to hypomania (which is also bipolar exclusive, not bpd, but less extreme) it MUST by definition cause impairment in functioning (hypothetical mania scenario: quitting your job and stopping taking care of yourself because you suddenly had this idea to fly to the moon and you wholeheartedly believe you'll be the next best astronaut in history and go down in the textbooks). dysphoric mania can exist also, where mania symptoms are present ALONGSIDE depressive symptoms simultaneously, but overall mania is so much more than having a bunch of energy and feeling really happy.
I might edit this if I think of anything to say but this'll probably get 0 notes