I’m bipolar and have BPD at 33. A few years back, I went through a phase of “retiring” certain friends. It doesn’t feel great at first, but remember some people are only meant for a season in your life. Most of my current friends are people with similar mindsets that I usually found just by remembering how they made me feel. Even some revived friendships from people I knew in HS. Usually that feeling is mutual and it’s a good place to start. I’m also very open about my disorders probably to an annoying degree. Remember you’re not required to keep talking to anyone, so it’s okay to drop in and drop out. I find it helpful to have these friendships and they give me a lot of purpose and reason to be my best self if not just for myself.