It's so important that parents are sensitive to all of that, aware of it and are adjusting their own behavior to account for these changes as they happen. Good parenting involves respecting the personal space of one's children, whatever their age, respecting children's' stated boundaries but also includes parents teaching their children about their right to boundaries -- both with parents and with everyone else -- through their own behavior with their children. We all first learn about boundaries at home, so if they aren't respected for us there, we can often have a hard time asserting them in other places and relationships in our lives.
Hey, Dad? I don't mean to hurt your feelings, but I need more personal space than you're giving me. I want you to respect my feelings and the trust that I have with you. If you keep disclosing the my personal matters to others, then I may have to limit my sharing with you for good.
Every person has the right to their own personal space, the right to basic privacy. No matter who it is, if ever someone is not respecting that, we all have the right to call that out, to uphold and insist on our need for personal space and privacy, and the right to outside help if ever anyone is refusing to honor our boundaries.