My cousin is an extreme introvert but a lovely person and I found myself oversharing with her recently and she looked shocked. She just got her Masters in counseling but even she was like, "Ummm, yeah, that might have been too much...."
Ditto with my brother. It took ten years to establish a terrific relationship with my brother because of expectations and not recognizing his boundaries. When I did, the whole dynamic changed on its own, suddenly he was calling me to get together and became the loving person I always wanted. But it's loving in HIS terms, not mine. By my own thinking he'd share his deepest darkest secrets with me if he cares about me. But that's not who he is! And many people are that way as well. I really appreciated the Christmas this year when conversation was kept light and cheerful.