This is a good question. I have to answer that it is something about the structure of my brain, whether it be the connectomes or the genes, for I have a tendency toward persevering that causes me to focus on one thing almost to a ridiculous degree. Often I will sit down to work on a project and continue for stretches of eight hours or more, rarely taking a break. Perhaps I will then not sleep and continue on for another eight hours, sleep very little, get up and keep going. If I make a mistake when I'm concentrating on tiny details, I will undo the mistakes and start again--even if I must begin again from scratch. Apparently, this perseverance habit is common for people who are like me (according to medical studies of brains similar to mine) and it can be both a blessing and a curse, depending on what the person in question is interesting in or focusing on.
On the other hand, there is another type of difficulty that requires another kind of "trying" and that is when there are interpersonal struggles or hardships that are not related to a project or task. The way that I keep trying during difficult times with others is much more confusing for me than if I were faced with a challenging task. I have had to develop strategies that sometimes work, other times do not, in order to stay motivated in the midst of chaos. Again, I find solace in the projects I'm working on and it is best if I maintain that focus and "avoid" social chaos.