According to a book I was reading, there's a comorbidity factor between OCD and body dysmorphic disorder. That may or may not help explain things. I used to be the exact same way about when I had to get a haircut, but now my body obsessions tend to focus on my weight. No matter how little I weigh I always see fat in the wrong places for a guy when I look in the mirror. I know I can't ever have a "perfect" body, but it's a struggle to stop obsessing over the little things.