You can be kind to everyone and close to only a few.

Kindness and closeness are different quantities, and treating them as one is exhausting, because then every pleasant person becomes a candidate for a very small inner circle. You can be generous and warm with dozens of people while only a handful know what is actually going on with you. That is not coldness. It is how anybody keeps a real life without running out of themselves.

Be decent to everyone this week, then be deliberate about who gets the true version. Pick two or three people and tell one of them something real. Warmth spent widely does not come out of that account.