Many writers write across difference of one kind or another. Sometimes the difference is large and recognizable: gender, or race, or religion, or sexuality. And sometimes the differences are smaller. ... Where authors get into trouble is in trying to make those different characters stand in for whole groups of people, or for creating characters only to fetishize or explore their supposed otherness. Your character can be wildly different from you, as long as he's written with respect and, moreover, specificity.