Tell them anything at all
It’s a nice feeling being able to tell someone anything and not be afraid that they will judge you or gossip behind your back later. You want to feel like you can trust that person and know that they won’t use this information to blackmail you later. That’s what real friendship is all about.
If you are having trust issues and can not talk to anyone, we understand, it can be scary at first, but you will have to let go eventually. If you ever hope to make any connections with other living human beings, trust is a key factor in that. So make sure you give people a chance at least.