Hello. Good to hear that you have an insight about there being something wrong with your mind. The concern to follow is natural. However, the tagine of a 'borderline personality disorder' might not be appropriate. Plus taking a test by yourself will not put you at any ease. It's like taking a Dolo or a crocin without really understanding your symptoms. I believe you should seek professional help.
Next Steps
Consult a psychologist. Understand the real problem.
Health Tips
Do not self-diagnose. The internet might give you a checklist that will only leave you more confused.