Why do we hide tears and feel ok to laugh?

This morning I was hurting by the departure of one of my closest friend and then I met few people who I was acquainted with and tried hard as hell to laugh...I was sad and instead of embracing my true feelings, I laughed...What kind of human psychology is that. I mean if you are sad then whats wrong in showing it? Why to hide your tears but share good stuff with others around you.

I know that you know the answer of this question as much as I do. We share laughter or good news because it doesn't make us vulnerable in front of others but when we cry we feel weak.. and trust me I AM FINE is the most dangerous sentence to utter when you really are not. Its a major cause of chronic depression. Because when you say, 'I am fine' to others, you are hiding things from them and at the same time you are lying to yourself without even knowing about it. It's a habit of brushing the issues under the carpet. It helps for the short time because if you are fine you don't have to do anything about it..RIGHT? but it bites back with high intensity and leave you more vulnerable and sometimes theres no turning back.

So friends, I am not suggesting you to open up your emotional box in front of everyone, but to stay honest about your feelings to yourself. This morning I told myself to accept the situation and accept that I was not fine. I was sad and it may take sometime to fill up the vacuum that has been created by fate in my life. And I suggest to anyone in similar kind of situation to accept your true emotions to yourself. Don't say I am fine if you are not.