I have trouble with mirrors too. When brushing my teeth, I have to focus on my teeth only. I do a cursory glance in the mirror to make sure I don't have anything in my teeth or make sure my hair isn't standing on end or something but otherwise I don't look. Too many times in the past, I have looked in the mirror too hard and ended up somewhere else with a smashed up face or bruised face not knowing what happened. I'm not sure what triggered me when I would look, not sure if I saw another family member's resemblance or just my own self triggered me but it's not worth it to me to look.