I've been reading Radical Together by David Platt, as well as studying Ephesians, and one of the things Radical Together says is that "We are saved from work, to do work."
God sent His son to save us, so that we may be a living testimony of how awesome He is. By His grace, we have been saved, so that we may do our part in pointing others to Christ.
If we are not here to serve God, then what are we here for?
Our job is to spread the Good News. Never be afraid of telling a person because of what they might think. It will be far worse for them to spend eternity in Hell. You must do your job, and God will do His. Don't be afraid of getting fired, or losing a friend, because maybe God didn't want you at that job, or He didn't want you with that friend.
Paul was in Prison for spreading the Good News, yet in Ephesians, and in pretty much all of the other books that he wrote, he would say that he counted it as a blessing when he suffered. He considered it a privilege when he was able to do his part for God's glory.
And the cool thing is, you don't have to be a professional to do it. God doesn't just use the pastors of mega churches, or the people who have grown up growing to church, and know the bible from front to back. He doesn't just use adults either. Sometimes, the people Jesus used to do the work, were the people no one would expect.
You see, if we could do it on our own, then God wouldn't get the credit. It is when we know that we are not equipped that God can do miracles through us.