trust yourself so much that you trust everyone

i think selfishness is something everyone should be practicing to a point where you can trust yourself so much that you know no matter what is thrown at you, you will be okay
but not as far as taking from others
kinda like a nobody owes me anything, I owe no one anything, but I owe myself everything mentality
this is the current mindset i’m going for and i’m looking for advice to further improve on it or any contradictory opinions

is this just one of those things that only sounds decent on paper, or is it something i should keep trying to achieve within myself?