Your attitude to work
Find out how much time and effort you devote to your work and if you should change something
You seem to have managed to avoid excessive ardor for work. Giving enough effort to work, you don't forget about your own life which we live only once and have to do it so that later we wouldn't regret that we had wasted our time. And if your colleagues want to take upon themselves too many obligations, you won't prohibit them to do it, but you won't take their example, preferring to commit heroic acts at work only in extreme cases, but this case can't happen every day. You know how to use your time and energy, that's why it's seldom you get tired and you enjoy the work you do. Perhaps you shouldn't change this tactics even if some people think that you're selfish. You have your own opinion on this question.