we're not used to hear "I'm not okay"
It seems like if we ask someone if they're okay, the obvious answer is "yes"
Almost if we're expecting to hear that they're doing fine
it's hard to answer with : "no, i'm not okay", "I"m having a hard time"
thats why i'm not going to ask
but 'm sure there are people who ask because they are geniunly worried about you..