This reminds me of Type A and Type B personality theory:

TYPE A: The theory describes a type A individual as ambitious, rigidly organized, highly status conscious, can be sensitive, care for other people, are truthful, impatient, always try to help others, take on more than they can handle, want other people to get to the point, proactive, and obsessed with time management. (AKA You)

TYPE B: The theory describes type B individuals as people who live at a lower stress level and typically work steadily, enjoying achievements but not becoming stressed when they are not achieved. When faced with competition, they do not mind losing and either enjoy the game or back down. They may be creative and enjoy exploring ideas and concepts. They are often reflective, thinking about the outer and inner worlds. Furthermore, Type B personalities may have a poor sense of time schedule and can be predominately right brained thinkers. (AKA laid back person)

I would imagine it would be hard for someone like you to develop more laid back tendencies. My advice to you is to try and live every day like it is your last day. You mustn't take life for granted. Enjoy your time on this earth because it is not infinite. 20-30 years from now you will look back on your life and hopefully say you've enjoyed it.