I feel really uncomfortable around a coworker. I feel like I always have them in my side vision. I'm not physically attracted to them. I try to avoid them. Does this mean that I'm somehow attracted to this person?

Only you can determine that. Sometimes people do that because they're kinda shy but usually they know when they like someone. Honestly, you'll have to do a little more soul searching and weigh things out. Bu from what I can see, I don't think you are if you're uncomfortable, you try to avoid them, and you're not attracted to them all in one package.