How can I convince people that I no longer want to share things about myself that I once WANTED to talk about?

This question may come across as egotistical—but only to the degree that I want to be understood and known by people close to me.

Maybe some of it is from resentment, or from feeling rejected. But not so long ago I was wanting to share things about my personal life and “inner world” that other people might not understand—and do so with great vulnerability and trust. But now I don’t. Sorry that’s a closed book now. As if to say, from not being heard when I needed to, I’ve sort of lost the momentum—and want to keep my inner world a more private realm.