But this isn't what it SAYS, this is your interpretation of what Matthew 16:18 says.
To me, it says very clearly "You are Peter, and on this rock I will build my Church."
Because I am Catholic, if I didn't understand what the scripture says, I go to the Magisterum -- the teaching authority of the Church. All Protestants have the same thing: if an individual doesn't understand something, they go to their Pastor. But different Protestant pastors will often render different interpretations ... even within the same denomination.
Catholicism is based on Scripture and Sacred Tradition. Many Protestants do not understand what Catholics really believe. Protestants don't like what they mistakening THINK is the Catholic faith. A little honest research might bring us closer together in Faith. One book I particularly like is Catholic and Christian, An Explanation of Commonly Misunderstood Catholic Beliefs.
I have many Protestant friends who I love dearly. One thing I noticed is that some of the best Catholic apologists are former Protestant ministers. They know their Bible, and they know more about the Catholic Church than I do, even though I was ostensibly raised in the Church. Catholics can and should learn more about their Faith. It is required of us, but many don't go past basic doctrine.
Exactly, and one that accepts and acknowledges what the Holy Spirit says to him, as Peter did. The Holy Spirit guides all men. The claims men make that only those in the succession of kings annointed by men, have perfect insight from the Holy Spirit have no basis in reality.