Hi, I think you mean "Don't take it so personally".
This may be used when somebody makes a joke about you with no intention to hurt you, but it makes you upset...the person notices you didn't like it, so he says:
"Don't take it so personally"
Or you feel somebody treats you in a grumpy way, and you think that it is personal, related to you...and it's just the way the person is with everybody...so again somebody that knows this grumpy creature and notices you're upset may say:
"Don't take it so personally"
Hope I've helped...bye =D