paranoia?

does anybody else experience extreme paranoia? i was just thinking about how when i was a kid i had an extreme fear of someone breaking in and murdering me and my family. this got to the point i couldn’t be in a room alone, not to shower or anything because i was so insanely scared. even now i still keep knifes next to me in case someone hurts me. is this a normal symptom of bpd? or does it just relate back to the “everyone’s out to get me” type of thoughts?