Kingdom come

I'm sorry for my writing. Most of you know it's not my strong suit, but i thought i'd get this off my chest and send it off into the abyss... to you, and to my Father.

I need help figuring all this out. What does it mean when we ask for the Kingdom to come? I know that in praying that prayer we are asking that God do something big... and I assume it's through His people. I want to be a part of it, and i believe i am. So here is the big question... what part?
Some people i know have had their purpose written on their heart, almost since day one of being re-born. When i say this i don't mean like a generic "love God and serve Him" purpose (which is at the heart of it all), but i mean a real specific purpose for their life. I sometimes sit in class and ponder this.
I felt a tug toward social work for a few reasons; 1. Good friends told me it would be a good place for me. 2. I love people 3. I am a child of God, and I believe God loves people more than I love people...and I could be a vessel for that love. I believe number three the most! But to be completely candid, i am starting to wonder if what i am doing is what God has designed me for.

In class, they tell us that we will have to seperate our personal beliefs from our professional ones... and i can't. I try and imagine the scenarios, and again and again, I cannot swallow the idea that when people who are beat up, cast down, and desperate for answers come to me...I am supposed to turn them to programs, or self help groups. If i did this i would be lying, cheating and denying them the real hope. Hope in Christ.
What can i do...? leave it up to everyone else? Give up? Lie?
I have always felt that God wants His people permeating the world, every inch of it... and giving Him all the glory.I feel like Christians should be doing whatever it is that they are doing with all their might. Whether they sweep streets or they change laws or they counsel those in need. I believe that through this.. God..will change the world and His kingdom will come.
But i'm still left with How?