Personally, this is how repeatedly asking if I'm okay will close me off.

Somebody asks me if I'm okay.

Let's say I'm not.

I start to debate with myself on whether to reassure them I'm okay, when I am not, or tell them the truth.

I know they want me to say that I'm okay. And I don't want to worry them.

But I am not okay and a part of me wants to tell them this.

What I usually end up saying is "I don't know."

So then the person says "Are you sure?" or something like that and just keeps pushing it and so I kinda get defensive like "Yes I'm sure, please leave me alone" and retreat like a turtle into its shell.

So maybe that's not asking "Are you okay?" "Are you okay?" "Are you okay?" again and again, but... you get it.

And of course when I actually want them to ask they never do.

It's only when I don't wanna talk.