Need to vent, I have no friends

Basically I’m on my 4th year out of school and since I graduated I have slowly lost friends and now I’m down to only having one. I’m very close with her but recently she has been invited to a bunch of parties and events and I haven’t been. And I know you are all going to say she obviously kept in contact with them more but the thing is she didn’t. She’s much more antisocial and prefers her own company.

So basically ever since I found out that I haven’t been invited it has really struck me that I am almost completely alone at this point in my life and it is breaking me. I want more friends but I don’t even get the chance to meet anyone else because I’m not invited to anything in the first place.

My best friend isn’t really understanding how much it kills me inside and says that I need new friends but then I’m back to the fact that it’s hard to meet anyone when I have nowhere to go and meet them.

I’m beyond sad and embarrassed and can’t stop thinking about how lonely I feel. I suffer from extreme anxiety, depression and bpd which makes it a little harder for me to socialise as I get very nervous.

Please be kind if you have any replies for me. I’m at one of my lowest points I have ever been