I am not sure about this, but at least in my family I have notice that the people with the more stress and anxiety are the ones always worried about arriving early to everything.
In my case, I obviously don't like arriving early, and in college I always arrived late to class, but you don't look like someone full of anxiety or stress haha, so perhaps you were just raised that way?
I'm a stressed person, I just hide it very well =). In University I always finished papers early and never arrived late to anything. I'm teaching myself to stress less, but when I travel for instance I'm the one always worrying about arriving on time to train stations or airports. I always take charge of logistics because I'm a control freak...I'm working on it though =)
Oh well, train stations and airports are a different subject because probably everyone do worry about arriving early to those places just in case, especially the airports :P