Unfortunately, sometimes you have to be a little mean to make people realize you're not someone to be played with. Not everyone respects kindness, but they will respect boundaries.
I have a deep respect for people's privacy. I can be very close to someone for years and still not know everything about them, and I never feel the need to ask. And It's not like I don't care. I believe that if someone hasn't chosen to share something, it isn't my place to ask!!
Adulthood humbles you. It'll turn you into a prayer warrior without you even noticing. As you grow, you start to understand that nothing in this life works without God.