Hi Heather. Welcome to Psych Central. i am 30 and just got diagnosed with BPD recently well so I understand how you feel right now, both shocked and somewhat relieved. I can relate to the issues with people and friendships and having such co-dependency problems. I feel my friends just keep dropping off and it makes me feel so lonely and abandoned and rejection is something i battle every day.
I'm sure you'll find much comfort and support here as I already have. This place makes me feel so much less alone and understood. Feel free to reach out whenever you need. Sending hugs your way.