Here's a truth for you. Abuse is abuse, regardless of the gender, age, or mental capacity of the abuser.
I'm sorry you've been hurt and sorry your family failed to take care of you as they should have. They had a responsibility to protect you and didn't.
Take it moment by moment, one step at a time. You only need to share what you feel you want to share and nothing more. It's your recovery, you're in control.
You'll find many here who can relate to being abused by cousins and family members, and even many who had family defend their abuser over taking care of them.