How to tell them it’s a trigger? TW Sexual abuse

So I get super uncomfortable when my breast or nipples are touched. I’m going to be exclusively pump because of this, people can say and think what ever the hell they want to I’ve already been given crap for it. I was assaulted when I was younger and again as a teenager by the same person and breast were a big part in it. I know I do want to explore why I’m choosing this to the doctors and LC tho just because I’m scared I’ll be pushed. I’m not sure how to explain it. I’ve already when told from family members I should be able to push past it for my baby and willing to deal with the feelings.