Why are we scared of emotions?

I wonder why so many people are  scared of EMOTIONS? I can't count the times when I was put down for simply feeling, especially when I could't hide tears. Most of the time we have to hide our tears, and not go too crazy with our laughter. Yet, it is so wonderful when you meet somebody that allows you to feel, and to express what you feel. I hope this websites to be a little bit like that. A friend that openly shares, and a friend that truly listens.