I'm new here so please bear with me

I'm 26 years old and only got diagnosed with BPD a few weeks ago after years of hell.. Also got diagnosed with anxiety disorder..
So..
My boyfriends cousin is coming round later for a drink and a chin wag, except I'm REALLY nervous/anxious, my boyfriends at work and the kids are out with my mum so il be alone..
I have a massive social phobia and can't keep my mind from going over every possible conversation we could have.. Wondering if shel know I'm uncomfortable in the situation.. Everything I say I will over Analize and wonder how it was taken and how it came across.. I have to let her come round she's practically family and I've met her quite a few times but my boyfriends always been there.. Not only that I want her to come too.. I need to try and get over this.. I'm frantically cleaning at the minute as I can't have people round without a spotless home either.. Arghh!! Am I being silly or can anyone relate? I feel like a child preparing for my first day at school...
