I too am faced with this same dilemma. I feel that counseling is a bit different than any other program, because the events that happened to us really shaped who we are today and what type of counselors we will become. I think share as you see fit. When I interviewed, almost every single candidate had some major event, either childhood abuse, rape, past addictions, etc that lead them to the counseling field. If you feel uncomfortable, don't share. But take comfort in knowing that there may be other people in the program who have gone through something similar.