I don't think the stories you shared are just childs play or nothing and I don't think you are being too sensitive. I would definitely share them with your therapist. I think they would be very traumatic. It could explain your fears of intimacy and dreams and such for sure. It sounds like there was force involved, and your family member and Instructor were both significantly older than you. I think attempted rape is traumatic indeed whether they were able to complete the act or not. And at 6, you were a young child. That shouldn't happen to any 6 year old.