I was not aware that I also had PTSD until well after that. There are many causative factors associated with both that overlap. The further we move away from our pasts the more we may tend to trivialize our pasts. In fact if you look at the list of symptoms above it would be quite easy to just change the wording a little bit and you would end up with the very way that the criteria for BPD is explained. There are no easy answers.
Recovery takes time.
Getting to the bottom of the puzzle that BPD presents you in your life may well mean being tested, diagnosed and treated for other presenting disorders. Do not try to categorize yourself. Let a professional assess you. Believe in yourself. Seek and be consistent in your seeking treatment.