Struggling with the Possibility of Having BPD

Is anyone struggling with thinking they might have BPD? I also have anxiety, depression, and PTSD and I always thought those were why I am the way I am. My best friend has BPD and she was diagnosed 10 years ago. She has told me she thinks I might have it too. I was in denial I guess. I mean what are the odds? But there's always been something that didn't fit right in my life no matter how hard I tried (and believe me I've tried it all). I finally did some research expecting to finally once and for all convince myself I don't possibly have it. But I could relate to an alarming amount of symptoms and questionnaires about BPD. Is this normal? With my other conditions, I could tell so early on in life and/or early after symptoms began. It's sort of like there's just always been this missing part of me and sometimes it's filled with this overwhelming void.