Ok

You only owe people what you want to tell them.
But that being said if you trust them it is fine to tell a lot too :)

I don't know how to put me in, they see other people's lives

None.

It depends on how close you are with that friend. The closer you are with the friend, the more secrets it's easier to tell them, at least in my opinion. What do you think?

Best friends yes

Selective

I don't trust nobody with my personal stuff

They can know what you want them to

Selective