Glory
Short answer: Look at why you want to become a police officer.
You want a career that makes you feel useful, like you're making a contribution through your work. You want to help keep your community safe, to protect its citizens from harm. You want to comfort a small child with a cuddly stuffed animal. You want to reassure an older homeowner you're keeping an eye on her house. You want to work with local residents through community watch programs, career day appearances, and police-sponsored youth sports programs.
In short, you want to make a difference. Finally, while you won't ask for a "thank you" in return, it would make your day to receive one.