I hate needles as well. I don't cry or scream, but I can't watch them open the needles, I can't watch them stick it in me, etc. I basically can't look at the needle at all. And it makes me physically sick even if I don't look at it, I get light-headed and I am nauseated and I usually require a bucket
It's one of the reasons (though not the most important reason) I want a natural birth. No epidurals for me! I'd rather go through a painful childbirth then have a needle in my back (and a huge one at that!).