How do your emotions affect your body?

You know, since I was a little kid I've never really been affected by stress like other people. I see the way the majority of my friends and family react to things, and firstly, it is not a pretty sight. Secondly, I never saw any use in 'freaking out'- crying and hyperventilating and the like. I didn't internalize it either, though- stress just never hit me that hard. The SATs, and college applications, and interviews, and track meets- I felt a sort of pressure, of course, but nothing uncomfortable. It was always a feeling that spurred me forward, that made me excited and excitable.
I let myself feel everything, because I don't believe that life is meant to be lived numb to everything. We need to feel to be able to react, and I've always felt sorry for people who think that cutting themselves off from their instincts and emotions, as it's an integral part of who and what we are. On the same token, though, I don't let my emotions run my body completely. I know people who, when sad, literally can't bring themselves to get out of bed or even try to crack a smile. I let myself experience the sadness, and then I let the strength of my other emotions- my happiness, my optimism, my hope- overtake that sadness and put it away. My body has never felt emotionally unbalanced for very long, and then only when something drastic happens. I try to live in a quasi meditative state; feeling everything, whether good or bad, toxic or nurturing, letting all my emotions filter through my body, sifting out the poisonous things like jealousy and grudge along the way until i'm left with the positive.