I'm going to skip the line at a grocery store
Why are you going to skip the line while shopping?
I want to finish up at the store quickly.
I understand that you are in a hurry, but you can't skip the line because of it. The people in front of you will be very angry when they see you  go in front of them.
I'm always in a hurry and the world is my bitch. If people complain, I'll just tell them I don't care about their mom's funeral.
There are going to be many people who are upset with you for skipping the line. This is going to make it seem like you think you are better than other people. Try your best to be more considerate of the people who have been waiting.