I'm socially awkward, how do I greet coworkers?

When I go to work I find it difficult to greet my coworkers when they’re talking, and my coworkers talk a lot. I don’t want to disturb them, so I don’t say anything and let them speak. After that I don’t find it necessary to greet them, because we’ve already seen each other. I don’t do it to troll them or because I...