What are some ways you knew you had bpd

I just recently saw a post about bpd and was like "huh that kinda sounds like what I've been going through" and then I read more and related to more and more of the symptoms but there is also a lot that I don't relate too. I was just wondering how people who do have bpd found out. I don't know if I'm just depressed and am overthinking this like I always do or not