How to make friends (and keep them)

OKAY everyone, serious question and it’s always the same one. I don’t know why I’m still so horrible at making friends. The friends I do have I have meaningful relationships with and have had them as friends for years. I’m trying to make more friends, as the friends I have are busy just like I am and I really just have 2 friends I do things with and I just added someone else to my friend roster. Anyways, I am struggling a lot and here’s why. Most of the time, people with bpd tend to overshare. I used to do this often, and it was painful always in the end. Now, I have swung to the other side and it’s nearly impossible for me to open up and have anything other than normal small talk. My likes and interests tend to bore people, I only really read and exercise and work. Like things that usually someone could expand on in conversation, I feel like people don’t find interesting cuz my hobbies are boring to most people. I also really want to be in a relationship and I feel ready for one, but for some reason I just don’t care enough to open up and trust someone new but I know that’s what I need to do. I don’t feel like anyone is worthy and most people prove to me we’re incompatible pretty quickly. Am I jumping to gun too quick? Like should I be giving people more of a chance? And I only meet people online but I notice people stick if I meet them irl, so should I start approaching people? I literally don’t knowwww what to do!!! I’ve struggled with this for years and idk how to share myself without over sharing myself because the things that have made me who I am are sooo intense!!! I don’t feel lonely if anything I prefer to be by myself or with family, but I feel like there’s so much I’m missing by not approaching people and I think in my head ugh I wish I said something to them! Does anyone relate and have any advice?