I do not hesitate to tell somebody I have a brain injury when my limitations become evident. I don't wine. I just state as a matter of fact that I have a brain injury and can not do 'such and such' very well. I may comment about my struggle with sound or poor memory skills. I also note that I limit my driving because of my brain injury. I try to frame it in a way that educates the other person(s) about brain injuries.