history: I have a coworker always disturbing me during working to talk to me about subject that I am not interesting in.  I have a coworker always disturbing me during working to talk to me about subject that I am not interesting in.
current: Oh that's frustrating, have you told them how you felt?
next: No, I am too shy to do that. This coworker start endless conversation and keep talking and talking. It is delaying me in work.