You know what man? I feel ya and I can relate. You did your duty, nothing more, nothing less, and the Army wants to give you an award for it. All you did was your job, you don't feel you did nothing special. I've been there, and after a gallon of stout, but I think I figured it out.
You have to get rid of your humbleness here, and take a step back and recognize what you did. Even if you were pushing papers, you were pivotal to accomplishing the mission. Because everyone is doing small, seemingly insignificant jobs, from the top down, as a team they are accomplishing the big job. And without each small part working, the big war machine will eventually fail. That is why the military is awarding you. Because you, and the others in your unit, did your duty, and that in turn helped achieve the desired mission.
So, put it on your class A's, or investigate your ribbon regulation. Some services allow people to wear their 3 highest awards. And when you do wear it, wear it with pride. You earned it, even if you don't think you did.
"Do your duty in all things. You cannot do more, you should never wish to do less." -- Robert E. Lee