There is a difference between taking the job seriously and becoming obsessed with it. Take the job seriously and find balance in your life.
What do you mean by tested everytime there is a use of force incident? If you think people aren't going to fight you because you're bulky, think again. One of my former partners was 6'5" 240lbs and I'm 5'9" 180. The guys who came out swinging always focused on him and it was like I wasn't even there.