"Screaming" isn't my test of whether or not to partake of the food -- trying to escape, is.
As far as plants "feeling pain," I don't think so, at least not on the same level as a creature with a beating heart, eyes, a brain, and the ability to live autonomously. At a cellular level, however, it would not surprise me that plants respond to stimuli - just by observing them we know that they take steps to rectify injuries, such as a tree forming a "scab" over a cut off limb as it grows.
It's fascinating to observe the way the rest of nature works, and, to be sure, we should respect all living things, but there is no real comparison between harvesting the grain from a dried stalk of wheat and slaughtering the newborn offspring of a dairy cow while its mother bawls to be reunited with her calf. No intelligent comparison that is.
Everyone has to make their own decision, of course, but I made mine years ago -- I will not lend by support, via my purchases, to an industry that raises animals for slaughter.
I'm healthier and happier as a result. While many around me stuff their faces with hormone-fed meats and mucus-laced milk that contains mucus, I consume vegetable sources of protein and avoid animal products and processed foods. I haven't been sick in years -- literally. I have more endurance, can run farther, and even lift more weight than I could in my teens.
Enjoy your steak if it makes you happy. I'll enjoy my health.