If one has a moral objection to eating meat on the basis that it is killing, then one cannot eat.
Anything.
Ever.
Unless plants suddenly started not being living things.
Here's a bit of philosophy to plug into your morality. It may help. "All life subsists on death, and everything must die." Your conscience may be somewhat less burdened by eating vegetarian since the bean-sprouts don't yelp when you pluck them, but most "fresh" produce is still alive when it's eaten. If you're eating bean-curd, tofu, or something of the sort you are, quite literally, eating babies or the product of mashed babies.
Think on that.
Also consider that we don't know for sure if plants can feel pain (at least not that I've heard from any credible sources), and if they could, they may express it in ways we cannot understand.
We feed ourselves with death in more ways than is symbolic or literal. Some people can't figure that out. And that's too bad, as it would save a lot of guilt, indecision, and wasted breath.