When did i get so mean?

Over the past few weeks people keep telling me that i am mean. I think they are just kidding, but really when i stop to think about it i have gotten pretty mean. I think most of it is just becoming so incredibly jaded. I no longer expect the best out of people. All day, every day, i feel like people just disappoint me. The atmosphere i am in 40 hours a week is pretty much "doom and gloom". i try to stay positive and happy, but its hard to when you are surrounded by people who are not. I think the stress of that plus other things just makes me very short with people. I dont mean to be a jerk, but i think i just come across that way. Another reason i think i come across as a mean person is because i do like to joke with people. i pretty much take nothing seriously and when im uncomfortable i make a joke. I think this scares people and people who have no sense of humor just think im being a giant ahole.

So now i am trying to be nicer to people, i really am, but some people just make it really hard. I am turning over a new leaf and just keeping my big mouth shut. It will be a new thing for me, but i think i should at least try to be more pleasant.