How you speak to people says a lot about you.
The way you interact with one coworker will be different than the way you interact with someone else.
Your tone can be blunt. And it is because you make statements and you don't ask. For example, you'll say, "I'm going to lunch," not "Is it okay if I go to lunch?" and because of that, some people take that as mean. But that's not your intention. You're just speaking your truth. And sometimes the truth can be hard for people to hear.
But if you notice how your words are received, you can adjust accordingly and make sure that your message is coming across the way that you want it to.