That was one of the most normal worries I've heard in a while. It always takes me a while to get my bearings in the morning. Of course, there's no need to take their "Good Morning" as a hinderance. Maybe they are trying to wake you up because they all like you better when you're fully alert. I wouldn't put too much thought into the situation. Just keep being you unless being you isn't working.
a general hullo is as far as i go and that is only to those that are in the office when i arrive what really fricken annoys me is the people who have do Hullo Imma, Hullo Smeg, Hullo R2K, Hull ManRam.... fricken individual hulloes.... just rack off and stop bothering people who i want nothing to do with aside from not getting in my way while i am working