Talk to Psychiatry on I Think I Have Bpd, Need Help In Diagnosis

In every relationship/friendship that i have its only good until we get close, the moment i truly start liking them, i get scared that they wont stay, i feel so intensly for them, i realise its not normal, i also ruin our entire relationship because of this. I want to have absolutely no boundaries, i feel like i want to become one with them. I feel extreme jealousy and possessiveness with them, and feel hatred for the person they might be close to. Even if there is no threat of abandonment i take precausions to prevent said abandonment, which only causes more harm in the relationship. Then i proper beg and plead for them to stay, when they eventually get tired of my unhealthy behaviour of mood swings. I get very emotionally unstable, and dont know how to handle it. Almost all my relationships are unstable, one day i feel extreme love and another day extreme hatred for the same person. Im certain im suffering with bpd.