Is it normal that i recoil and shake when i get a bad sensation?

As the title says. Whenever I touch something like cardboard, or hear chalk, or so much as see a certain texture, my eyes roll up and sometimes fling my head back. I start shaking super hard and force my head back down with my chin touching my chest. All of this in around 3-4 seconds. This sometimes also happens when it is cold. My brother does this too, but with not as much ferocity as me. More like a small shiver. I used to get told off for doing this by my dad's second wife, but no matter how hard I tried, I simply cannot stop doing this. I want to learn how to stop this, but I dont know how.