I'm sorry, PM, but my heart was absolutely crushed when I read this response. It is such a distortion of God's heart and nature.
Duhfur, I pray you did not take his post to heart.
God does not call everyone the same way and to insinuate that someone (especially as young as 25) who has not discovered what the Lord is calling them to is a dissapointment to the very the Lord nothing less than tragic.
Duhfur, you're so not alone, and you have not done anything wrong. I used to agonize about what I was supposed to be "doing" for God, too. I cant tell you the stupid stuff I used to put myself through trying to find out what that was. Then one day, the Lord asked me "Who do you think is more important to the King: a very skilled worker ... or his closest friend that he can trust and confide in?" In that moment, the Lord had shared a very tender part of His heart to me. He showed me that most Christians want to work for Him, when He is looking for trusted, intimate friends.
That's exactly how the Lord called the greatest heros of the Scripture: Abraham, Noah, Enoch, Josheph, Moses, Joshua, David, the disciples and the list goes on and on.
The very cool thing about that is when the Lord shares His heart about a matter, He will often give you the priveledge of taking part in the matter, and from there, if He has a specific calling for your life out of that, He will show you. In my case, He's not called me to anything specific, instead, He has simply asked that I be available to do for Him whatever is needed in the moment, which is just as great a calling as any other.
Just ask the Lord you want to become someone He can call His friend, and watch the awesome things that happen.
In His Love,
PottersClay