Oh, you can appoint yourself the Emperor of North America for all I care. Why not the world? In your own mind you can be whatever you wish to be. But the trick is for the world to recognize that in you.
God did not give you authority. He gave you talents which we all should use to multiply them for the benefit of the world. In that I respect your faith and your desire to spread the word of God.
God gave specific authority (powers) to his Apostles and to the Church He established, reminding us that not all are apostles, prophets and presbyters, and teachers...
His apostles were left in charge. No one was walking around with a Bible in his or her hands in those days. God did not leave us a neatly bound Bible in our hands and He did not command the people to "read, tech and minister." He gave the powers to bind and loosen to the apostles and they gave it to their successors, other people's rationalizations notwithstanding.
I am a member of His church (like it or not)
My local church, which adheres to the principles found in Scripture, has appointed me a teacher. I also exhibit the gift of prophecy (not foretelling the future, rather the biblical meaning of prophecy). These gifts are strictly bound by what is found in Scripture.
Other Christian organizations have recognized this gift in me and I have diligently studied Scripture in order to prepare myself to give that ready answer that Peter speaks of.
The Bible was around in those days. The Old Testament Scriptures were readily available and the New Testament Scriptures were widely circulating. God did not leave the world with JUST the witness of His apostles. And, contrary to your comment, the Apostles were not in charge - God was. The apostles were men lead by God. They took what He taught them and wrote it down that future generations may read and KNOW that He alone is God.
*Such an act, actually, would show more humility :)