I don't know if I have BPD but I notice whenever plans change on me last minute even if it's something super small it makes me so angry. For instance, today my roommate/best friend and I had plans to go to the library to study, but before that she had to go sign a lease for a diff apt she's moving to, and the girl she's moving in with asked if she could come to the library with us when my friend told her she had to go. Neither of us wanted her to come but couldn't really say no so she came with, but it made me so annoyed and I felt bad for being annoyed but I couldn't change it. They also got high before we went to study so maybe that annoyed me more because we had plans to like actually do our work but I was sober and they were high and having fun.