A different me

I was busy the whole day...
One of my colleague passed-by and say hello to me...
I just smile and didnt talk much...
He turned to me and said this...
"U know what... I can hardly see u smile during working time..."

I heard the similar word from my other fren few days ago...
He said he dont dare to talk with me during working hours...
And when he go out with me...
He couldn't imagine i'm the Angie that he knew in the office...
It's totally 2 different person...
One is serious with a fierce look...
One is humorous & childish ...with lots of smile on face & lots of fun...

I don know i can give people such a feeling...
May be it's because i'm a gemini...