Talking to a friend is often a very good idea. You need to know your friends and have a feel for the context so that you feel like this person is safe to talk to and you are in a good place, etc. You could have BPD, but it also could be something else, so keep in mind that you don't know that you have that and might not want your friend to think of you with that label.

I remember being scared to death to talk to anyone. People tend to be a lot more accepting than you think they will be. There are exceptions. But it gets easier, and you might find that you have friends who can relate to how you are feeling. About one in three people have some kind of mental illness during their life time, and I think that is a very low estimate. I think that a lot more than that do but a lot hide it and don't admit to it or get any help.

The best way to end stigma is for people to be more open about it. If we heard about our friends going to therapy for anxiety or depression as much as we heard about it when they have to go to the doctor for strep throat, people would be more comfortable about mental illness because it wouldn't be some stranger out there anymore. It would be people that we all know and even like and care about.

Anyway, I cautioned you about BPD because I used to think that I had BPD and had a friend that I thought I could trust and her mother had BPD and I told her that I thought that I did, and she had bad experiences growing up with her mother and it turned her against me. And I don't have BPD. I have high sensitivity and problems with social skills and emotion regulation because I have Asperger's, but even though that was something I always felt like it described me, nobody was willing to entertain that idea. It is possible to have both. It was just a couple of years ago that I found a therapist who could recognize that what I have is Asperger's.